AL 811 AMERITRON 811H User Manuall

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PLEASE READ THIS MANUAL BEFORE ATTEMPTING TO OPERATE EQUIPMENT!!

UNPACKING INSTRUCTIONS

1. Carefully lift the amplifier by the bottom cabinet edge out of the shipping carton. Place the

amplifier on a firm, level surface and carefully inspect it for shipping damage. Contact the

shipper immediately if any damage exists. Save the carton and packing material for possible

shipping in the future.

2. Remove the twelve screws holding the cover on with a number 2 phillips screwdriver.

Carefully lift the cover off the amplifier. Save the screws to rescuer the cover. Note that the

AL811H is shipped with the fuses and fuse caps inside the amplifier.

3. Locate the fuse pack with the two 12 ampere fuses and fuse caps. If additional screws are

needed, they will be in the fuse pack also. NOTE: Fuses supplied are for 120/110/100V

operation (Models AL-811H/HY). If you are rewiring the AL-811H for 240/230/220V

operation, you must use 8 ampere fuses. The AL-811HX export model is pre-wired for

240V operation and is supplied with 8 ampere fuses.

4. Remove the foam packing material (around the tubes) that secures the 811A tubes during

transit. Carefully unwrap the tubes. Do not dislodge or break the shaft that is connected to

the rear input bandswitch wafer.

5. To install the tubes in the sockets, be sure the large diameter pins line up with the two large

diameter holes in each socket. Do NOT rock or twist the tubes excessively during the

installation. If the tubes are already installed, check them for proper seating. If necessary,

press the tubes down into their sockets with gentle force. Do not rock or twist the tubes

excessively. Also, check that the anode caps are secure and that they did not come loose

during the unwrapping process.

6. The white ceramic anode connector will have to be removed from the top metal cap of each

tube if it ever becomes necessary to remove the tubes from the amplifier. This can be a

difficult procedure because the high clamping force of the internal springs in the anode

connector may hold it to the cap very tightly. The tube will break if direct upward or rocking

pressure is applied in an attempt to remove the connector. The safest way to remove the

ceramic connector is to lift the tube out of its socket. A twisting or spinning pulling motion

can then be applied while holding the ceramic connector firmly until the tube and connector

are separated. Repeat the procedure with each tube.

7. Install the cover with the vent holes to the left (near the tubes) by installing the back screws

first. Install all the screws loosely and tighten them only after all the screws are in place.

8. Install the fuses and fuse caps on the back of the unit. Read the manual to become familiar

with the operation of the AL-811H amplifier.

2

AL-811H LINEAR AMPLIFIER

FEATURES

The AL-811H is a grounded grid linear amplifier developed by

Ameritron using low cost 811A power triodes. It operates in

class AB2 for SSB and CW.

1. Fast Warm Up Time: The 811A tubes take approximately

10 seconds to warm-up.

2. Long Tube Life: The 811A tubes are long life, reliable

transmitting tubes. 811A tubes offer rugged, reliable

operation even on RTTY and SSTV.

3. Tuned Input: A Pi-Network tuned input matches the 811A

tubes to 50 ohm exciters.

4. Two Illuminated Panel Meters: The AL-811H has two

illuminated panel meters. The Grid Current meter provides

a continuous reading of the 811A grid current to indicate

proper loading of the amplifier. The other meter switches

between high Voltage (HV) and Plate Current (Ip).

5. Multi-voltage Heavy Duty Transformer: A unique

"buck-boost" winding allows adjustment of primary

voltages to match a wide range of line voltages centered on

110 and 230 volts. This versatile Ameritron feature allows

the user to maintain optimum voltages on the tubes and

other components to obtain maximum performance and life.

6. Vernier Plate and Load Adjustments: Both tuning

controls have vernier 6:1 reduction drives for smooth tuning

logging scales for accurate and rapid tune-up.

7. Safety interlock: AC input power is removed from the

transformer when the cover is removed. Never attempt to

defeat this switch.

8. Operate/Standby Switch: Used to remove the amplifier

from the RF line while filament and plate voltages are

maintained during "barefoot" operation.

9. XMT Indicator LED: Provides a front panel indication of

proper amplifier keying by the exciter.

10. ALC: The drive level is detected to provide a control

voltage for the exciter. ALC prevents over-driving of the

linear and reduces distortion from excessive drive power.

11. Neutralization Circuit: Reduces unwanted feedback to

improve performance.

CAUTION: This amplifier must be disconnected from the

power mains before removing the cover. See the precaution

on page 7.

TECHNICAL SPECIFICATION AL-811H*

Frequency Coverage

Domestic model(AL-811H): 160, 80, 40, 30, 20, 17 and 15

meter bands

Export model(AL-811HX/HY): 160, 80, 40, 30, 20, 17, 15, 12,

and 10 meter bands.

Input

Circuit type: Pi-network, slug tuned coils

Maximum VSWR at resonance: 1.3:1

Minimum 2:1 VSWR bandwidth: 15%

Maximum drive power permissible: 85 watts

Typical drive for rated output: 65 watts

Output (7MHz)

Typical SSB PEP voice operation: over 800 watts continuous

Typical CW continuous operation: 600 watts

1/2 hour PEP two tone: 650 watts

1/2 hour continuous carrier: 400 watts

ALC

Negative going, 0-12V, adjustable, phono jack

Power Supply

Circuit type: full wave bridge rectifier

No load voltage: 1700V

Full load voltage: 1500V

Full load current: 700mA

Regulation: 15%

Maximum draw at rated output: 10A (120V)

AC Input: 120V, 50/60 Hz (AL-811H/HY

240V, 50/60 Hz (AL-811HX)

Metering

Multimeter: reads HV and plate current

Grid meter: reads PA grid current

Connectors

Relay: keys amplifier when grounded. Sources +12 VDC open

circuit and supplies 100mA when grounded. A built-in

pulse canceling diode protects the exciter.

RF input: SO-239, 50 ohm input.

RF output: SO-239, 50 ohms with full power, into any SWR

below 3:1.

Power: NEMA 5-15P 120V grounded style.

ALC: Phono Jack. Supplies up to 12 volts of negative voltage

for ALC control of exciters.

Physical

Dimensions: 15.5" D x 13.75"W x 8.25"

Weight: 30 lbs.

*Specifications are subject to change without notice or obligation.

Exact performance measurements may vary due to the accuracy of the test

equipment and the measurement methods used.

3

GENERAL INFORMATION

SAFETY INTERLOCK

The interlock switch stays closed to allow AC line voltage to

reach the power transformer as long as the AL-811H's top cover

is in place. When the top cover is removed, the interlock opens

and disconnects the input line voltage. This does not discharge

the bank of power supply filter capacitors. Be sure to allow the

filter capacitors to discharge before you touch anything inside

the amplifier. You can select the High Voltage function of the

Multimeter to check the high voltage potential.

WARNING: never remove the cover of this amplifier with

the unit plugged into the power line.

DRIVING POWER

This amplifier is designed to operate at full ratings when it is

driven by an exciter that has approximately 70 watts of RF

output. You can use an exciter that has lower output power, but

the amplifier's output may be less. If you use an exciter that

delivers more than 70 watts, carefully adjust the driving power

to avoid "over drive" and the creation of spurious signals, which

could create needless interference to other operators. We highly

recommend that you use a monitor scope for continuous output

monitoring. The display on an oscilloscope is the best readily

available way of determining the amplitude of the voice peaks

which, if excessive, can cause "flat topping" and splatter.

IMPORTANT: Do not increase the drive power unless the

amplifier output power also increases. Grid current climbs

rapidly and the plate current meter and output power will

barely increase with excessive drive. This condition

indicates the amplifier LOAD control needs to be advanced

to a higher number. Excessive plate current indicates the

drive power limit has been reached. Non-linear operation,

splatter, and excessive grid current will occur if the

"LOAD" setting it too low.

FILAMENT SUPPLY

The filament circuit of this amplifier satisfies all requirements of

the tube manufacturer related to tube performance and life.

Inrush current is controlled by the transformer's internal

resistance and impedance, filament choke resistance, and

filament wiring resistance. To insure maximum life of the tube,

never replace any circuit components or wiring with substitute

parts.

ALC CIRCUIT

The ALC circuit converts a portion of the RF drive voltage at

the exciter end of the tuned input circuit to a negative going

control voltage. This voltage should be used to limit the exciter

drive to safe drive levels for the AL-811H for exciters that

develop more than 70 watts of output power.

A capacitive divider consisting of C27 and C28 is used to reduce

the RF voltage and drive a rectifier circuit consisting of D17 and

D18. The resulting voltage is filtered by C29 and R12 and is

applied to the ALC potentiometer R14. R13 provides RF and

DC isolation for the ALC jack. The DC isolation prevents

loading of the exciter ALC input line by the ALC potentiometer.

The ALC circuit can be adjusted by loading the AL-811H

slightly beyond the recommended maximum values with the

ALC line disconnected. The ALC line can then be connected

and the ALC control on the amplifier can be adjusted to a point

just before the drive begins to decrease.

NOTE: The primary use of the ALC function is the prevention

of excessive drive levels. This circuit will not prevent small

changes in output power from occurring on different bands.

Under most conditions destructive levels of drive power are

those above 100 watts. Slight changes may occur in maximum

output power on different frequencies with the ALC connected.

A compromise in ALC adjustment may be necessary to achieve

acceptable performance on all bands.

PLATE SUPPLY

The power supply in this amplifier uses a combination plate,

filament and control transformer. A buck boost winding is

provided to allow the user to compensate for low, medium or

high power line voltage. This amplifier is normally supplied

wired for the highest power line voltage setting. Never change

this setting unless you are positive that performance is suffering

due to low filament and plate voltages. The life of components

will be shortened drastically if the high voltage exceeds 1800

volts at rest. The diagram on page 4 shows proper wiring for

each voltage. Never attempt to rewire this amplifier while it

is connected to power.

EXPORT MODIFICATIONS

A simple modification will allow operation on frequencies above

15 meters. Instructions for this modification are available by

sending a written request for "Export Modification Instructions"

along with a copy of a valid amateur license. There is no charge

for this information. Export models are shipped with this

modification and have either "X" or "Y" following the serial

number. Standard frequency coverage is indicated in the chart

on page 7.

TECHNICAL ASSISTANCE

Technical assistance is available during our normal business

hours on weekdays. the following information is required to

assist you with operational problems:

1. Model and Serial Number

2. Date of purchase and dealer

3. An accurate description of the problem

Meter readings at all stages of the tuning procedure are very

important along with a complete description of the other

equipment used with our product.

Written assistance is also available. Due to time delays in processing

mail, please allow at least three weeks for a written reply.

AMERITRON

116 Willow Road

Starkville, MS 39759

Telephone: (601) 323-8211

Fax: (601) 323-6551

4

METERING FUNCTIONS

The AL-811H has two illuminated panel meters. The right

meter reads PA grid current up to 200mA. The normal current

with a single tone (carrier) signal will be 150mA to 175mA. If

the current is too high during full power operation, the loading

control should be advanced to a higher setting.

If the current is too low, the loading control should be turned to

a lower setting. The left meter reads PA high voltage up to 2000

volts and plate current up to 750mA. The normal readings are

1400-1600 volts HV and 650mA of current at full rated output

with a single tone signal.

INSTALLATION

LOCATION

Do not operate the amplifier in excessively warm locations or

near heating vents or radiators. Be sure air can circulate freely

around and through the amplifier cabinet. Provide an

unobstructed air inlet for the blower. Do NOT place any books,

magazines or equipment that will impede the free flow of air

near the sides of the cabinet.

VENTILATION

The AL-811H ventilation system has been designed and tested

to maintain the 811A tube temperature safely below the tube

manufacturer's rating at 500 watts output with a 100% duty

cycle. To insure proper ventilation in your installation, observe

the following:

1. Do not block or restrict the ventilation holes in the cover.

2. The exhaust air flow is over 20 CFM. Do not "assist" the

air flow unless the fan exceeds the AL-811H fan CFM by a

factor of 2:1.

3. Do not mount additional fans on the AL-811H cabinet.

4. The exhaust air will become warm at high power levels. Do

not place any heat sensitive objects in the exhaust air

stream.

GROUNDING

Connect a good earth or water pipe ground to the ground post on

the rear panel of the amplifier. Use the heaviest and shortest

connection possible.

Before you use a water pipe ground, inspect the connections

around the water meter and make sure that no plastic or rubber

hose connections are used. These connections interrupt

electrical continuity to the water supply line. Install a jumper

around any insulating water connections you may find. Use

heavy copper wire and pipe clamps. It is best to ground all

equipment to one point at the operating position and then ground

this point as described above.

POWER CONNECTIONS

The AL-811H is supplied with a NEMA 5-15P plug for 120V

operation. The power required to operate the AL-811H/HY is

not high enough to warrant 240V operation unless 120V is not

available. The fuses should be 12 ampere fuses for 120V and

they must be changed to 8 amperes for 240V operation. The

diagram to the right shows the proper wiring for 120V

operation.

Operation on a voltage of 240V is not required, nor will it

necessarily improve performance. The power transformer will

perform equally well with a power line frequency of 50 Hz or 60

Hz. The Transformer Connections chart at the bottom of this

page shows proper connections for various line voltages.

WARNING: The green wire connects to the chassis of the

amplifier and it must connect to the safety

ground of the outlet.

The AL-811HX (export model) is wired for 240V, 50/60 Hz

operation. The appropriate plug is not provided for this model.

You must wire the proper plug on the end of the power cord

supplied. Simply cut the existing plug off and wire the

appropriate plug in its place. If the line voltage in your country

is not 240V, then you must change the transformer to the

appropriate setting indicated by the chart below. Note: the AL-

811H transformer allows operation on 100V line voltage in

countries such as Japan.

NEVER REWIRE THE POWER SUPPLY TO BOOST THE

HIGH VOLTAGE ABOVE 1800 VOLTS. ALSO, DO NOT

ATTEMPT TO REWIRE THIS AMPLIFIER WHILE IT IS

CONNECTED TO POWER.

The wiring between the fuse box and the amplifier AC outlet

must be 14 gauge or larger in order to supply the operating

current required (10 amperes) without a significant drop in the

line voltage. The outlet should be fused for the wire gauge used.

VOLTAGE BUCK BOOST PRIMARY

*120 A to 1, B TO 2 C to D, E to F

110 1 to 2, (A,B OPEN) C to D, E to F

100 A to 2, B to 1 C to D, E to F

For 240, 230, 220 all three primary conditions apply ↓

**240 A to 1, B to 2 no connection C to D

230 1 to 2, (A,B OPEN) D to E

220 A to 2, B to 1 no connection E to F

*Factory wired operation for the AL-811H

**Factory wired operation for the AL-811HX

5

INTERCONNECTIONS

1. Connect the RF output of the transmitter or transceiver to

the RF IN connector on the rear of the AL-811H with 50

ohm coax. Use any 50 ohm cable (RG-58 is fine) with PL-

259 plugs.

2. Connect the existing station antenna system to the RF OUT

connector on the AL-811H with any 50 ohm coaxial cable

capable of carrying 650 watts.

3. Use shielded audio type cable with standard male phono

plugs to connect the RELAY jack on the AL-811H to the

exciter's normally-open amplifier keying circuit. The

keying circuit in the AL-811H has a positive 12 VDC open

circuit and it provides 100mA of current when connected to

ground. The AL-811H has an internal back-pulse canceling

diode across the relay coil.

4. Connect the shortest possible ground lead from a good earth

ground to the GND terminal. The best leads are solid

(instead of stranded or braided) copper. It is also best to

use a common ground point for all the equipment in the

station.

5. Use a shielded audio cable with standard male phono plugs

to connect the ALC out jack on the back of the amplifier to

the negative going ALC input jack on the exciter. Do not

connect this line until you have read and understand the

function of the ALC circuit. Exciters with output powers

below 70 watts do not normally require this connection. If

this jack is connected without adjusting the ALC control,

the exciter may not develop any drive power.

6

TUNE-UP

CW PROCEDURE

Follow the instructions in numerical order. If the various meter

readings are different than those indicated in the instructions,

check the connections from the exciter to the amplifier and make

sure they are correct. Consult the manual for the exciter, if

necessary. Be sure the transformer is correctly wired for your

line voltage. See the POWER CONNECTIONS

instructions on page 4 for wiring details.

1. Set the AL-811H front panel switches as follows:

POWER/OFF-ON to OFF

XMT/OPR-STBY

to STBY

METER/Ip-HV

to HV

2. Plug the line cord into a proper voltage outlet.

3. Set the

POWER switch to the ON position. The meter

lamps should light and the fan should start. Read the 2000

volt scale on the multimeter. It should indicate 1700 volts

nominally and no more than 1800 volts.

4. With the amplifier XTM switch still on STBY, tune the

exciter into the normal 50 ohm load according to the

manufacturer's instructions. Turn the exciter drive fully

down after tuning.

5. Place the amplifier bandswitch on the same band as the

exciter, the PLATE control in the dial range for the band

selected, and the LOAD control as indicated:

MHz Plate Load MHz Plate Load

1.80 1 1/2 6 1/2 10.1 7 1/2 0

1.90 3 7 1/2 14.0 9 3

3.5 5 2 18.1 9 2 1/2

3.7 6 3 21.0 9 1/2 4

4.0 6 1/2 5 1/2 24.9 9 1/2 4 1/2

7.0 8 3 28.5 9 1/2 5

7.3 8 3 1/2

6. With the exciter drive still at zero, place the METER/HV-

Ip switch in the Ip position. Observe the 750mA scale. It

should read zero. Place the XMT/STBY-OPR switch in

the OPR position.

7. Key the exciter (no drive). The Transmit (XMT) LED

should light. Observe the plate current on the 750mA scale.

It should be 125mA.

NOTE: The no drive current will vary up to 25% due to

component and line voltage tolerances.

8. Apply only enough drive to indicate a grid current of

100mA, or an Ip of no more than 450mA. Tune the

PLATE control for maximum output power. It is normal

for the plate current to dip at this point. If the grid current

goes over 200mA, reduce the drive at once. Unkey the

exciter.

9. Observe the output on an external RF wattmeter. Increase

the drive until full exciter power (never to exceed 80 watts)

or 200mA of grid current, is achieved. Quickly adjust the

PLATE and LOAD controls for maximum output power.

10. Reduce the drive until the desired output levels are

obtained.

NOTE: Rotating the LOAD control clockwise reduces grid

current for a given amount of drive. If the LOAD

control is set at too low a numerical setting, a severe

stress on tank components may occur. The PLATE

control should always be peaked for maximum grid

current or output power. Do not exceed 750mA of

plate current during tune-up.

7

OPERATION OF OTHER MODES

SSB:

Tune up the exciter and amplifier as described in TUNE UP

section and switch the exciter to SSB. Normal ranges of meter

readings on SSB are between 20 and 50 percent of the CW

carrier readings. This is due to the different peak-to-average

power ratios in the operator's speech waveform. The only true

way to measure peak output power is with a good peak reading

wattmeter or monitor scope. A whistle should produce the same

values obtained on CW. Any effort to run more than these

values will produce splatter and distortion.

FM, RTTY, PACKET, AMTOR:

The plate current should be limited to 400mA maximum. The

grid current should be limited to 120mA and the amplifier

should be tuned for peak output power with the drive reduced to

hold the grid and plate currents below the ratings given.

NOTE: Some exciters put out short duration high power RF

pulses when first keyed. Exciter power output peaks may reach

or exceed full output level settings even if the exciter's power

control is adjusted to deliver a fraction of full power under

"keydown" conditions.

The amplifier loading control must be set high enough

(clockwise) to prevent extremely high energy levels from

developing in the plate and grid circuits of the amplifier. DO

NOT "UNDERLOAD" THE AMPLIFIER TO REDUCE

POWER. Never "retune" the amplifier to produce higher

efficiency with reduced drive except under the FM, RTTY,

PACKET, and AMTOR section. Poor linearity, splatter, or even

damage to components, may result from failure to follow

instructions.

QSK OPERATION

The open frame relay in the AL-811H takes approximately 15ms

to switch states. This precludes using the standard internal relay

for QSK CW operation. Commonly available vacuum relays are

very marginal for high speed QSK operation. At 60 WPM less

than 50% of the available receive time can be used due to the

slow speed of vacuum relays.

On PACKET, AMTOR and other modes delay can be added to

the transmit and receive changeover to use either vacuum or our

standard conventional relay effectively. Ameritron offers a high

speed switching option for operators who require high speed

switching between receive and transmit. The system switches in

one mS. Therefore, these systems are several times faster than

available vacuum tube relay systems and they allow over 90% of

the available receive time to be used at 60 WPM.

The QSK-5 stand alone PIN diode switch can be used with

almost all types of amplifiers and transmitters. No modifications

are required to the amplifier with the QSK-5. Contact

Ameritron for details on the QSK-5.

The AL-811H will operate with full output on all WARC bands except 24.5 MHz

The AL-811HX/HY will operate with full output on all WARC bands

STANDARD FREQUENCY COVERAGE

AL-811H AL-811HX/HY

160 meters 1.8 - 2.0 MHz 160 meters 1.8 - 2.0 MHz

80 meters 3.5 - 4.0 MHz 80 meters 3.5 - 4.0 MHz

40 meters 7 - 7.3 MHz 40 meters 7 - 7.3 MHz

30 meters 10.1 - 10.15 MHz 30 meters 10.1 - 10.15 MHz

20 meters 10.4 - 14.35 MHz 20 meters 14.0 - 14.35 MHz

17 meters 18.1 - 18.2 MHz 17/15 meters 18.1 - 21.45 MHz

15 meters 21.0 - 21.45 MHz 12/10 meters 24.9 - 29.7 MHz

WARNING!!

DO NOT ATTEMPT TO PUT THIS AMPLIFIER IN SERVICE WITH THE COVER REMOVED!

CONTACT WITH VOLTAGES INSIDE THIS AMPLIFIER CAN BE FATAL! ALWAYS

DISCONNECT THE AMPLIFIER FROM THE POWER MAINS AND WAIT FOR THE FILTER

CAPACITORS TO DISCHARGE BEFORE REMOVING THE COVER.

8

PERIODIC MAINTENANCE

The high voltage present on the plate choke and air variable

capacitors attract dust and dirt out of the air stream. It is

particularly important that the high voltage areas at the bottom

of the of the plate choke and the insulator on the air variable

capacitors be dust free. These areas should be inspected every

few months if the amplifier is operated in a dusty environment.

Unplug the line cord, and wait at least 90 seconds until the

power supply capacitors discharge. Remove the cover and

connect a jumper wire from ground to the anode connection of

the tubes. NOTE: This is a safety wire that must be installed

when beginning service work and must be removed when

work is finished.

Use a soft bristle brush dipped in alcohol to clean previously

mentioned areas.

Amplifier Tuning Chart Log

BAND LOAD PLATE

160 CW

160 SSB

80 CW

75 SSB

40 CW

40 SSB

30 CW

20 CW

20 SSB

17 CW

17 SSB

15 CW

15 SSB

Fill in this chart with your actual settings and you can quickly change bands in the future.

We suggest you use a pencil as settings may change as you alter your antennas.

NOTES:

AL-811H SCHEMATIC

9

Power supply shown wired for 120V operation *

10

AL-811H INPUT CHART

BAND C3 (pF) L1 C4 (pF)

160 28.75T (405-1287) 1300 (208-5177)

80 100 (208-5174) 23.75T (405-1237) 500 (208-5691)

40 750 (208-5668)

13.75T (405-1137) 500 (208-5691)

120 (208-5606)

20/30 330 (208-5331) 9.75T (405-1097) 270 (208-5775)

15/17 120 (208-5606) 6.75T (405-1067) 150 (208-5396)

10/12 180 (208-5605) 4.75T (405-1047) 100 (208-5174)

PARTS LIST

Designation Description Ameritron Part #

B1 Fan 410-3583

C1, 2, 21, 22 0.01 uF, 250VAC/1.4KVDC Dis. 200-2122

C3, 4 See Input Chart

C5, 7, 19, 37 0.01 uF, 50V Disc 200-0416

C6 2200 uF, 25V Elec. 203-0207

C8-11, 29, 30, 32-36 0.01 uF, 1kV Disc 200-2121

C12, 27 27 pF, 500V DM10 208-5404

C13, 31 0.001 uF, 7.5kV, Disc 200-7224

C14 Air Variable 204-2572-1

C15, 16, 17, 18 210 uF, 450V 203-0578

C20 0.1 uF,50V Disc 200-0754

C23, 25 360 pF, 1000V DM19 208-6688

C24 500 pF, 1000V DM15 208-6691

C26 Air Variable 204-2113

C28 150 pF, 500V DM15 208-5396

D1 Bridge Rectifier 300-9646

D2, 16 1N4007 300-0266

D3 MV6753 Red LED 320-0522-1

D4 - 15 1N5408 300-0145

D17, 18 1N34A 300-0346

DL1, 2 Meter Lamp 420-0320

J1, 2 SO-239 610-2126

J3, 4 Single Phone Jack 600-1225

L1 See Input Chart

L2 Choke Filament 10-15115

L3 2.5mH Choke 402-1162

L4 5 1/2 inch Plate Choke 10-15197

L5 #16 Air Coil 404-0811

L6 HF Coil 10-13140

M1 Plate HV/IC Meter 400-2601

M2 Grid Current Meter 400-2600

R1 33 ohm, 1/4 Watt 100-1330

R2, 3, 4, 5 50k, 7 Watt, Type 170S 103-7580

R6, 7 1 Meg 3 Watt 103-2223

R8 1.5 Ohm 3Watt, Type 135 103-3400

R9 .6 Ohm, 3 Watt, Type 135 103-3399

R10 330 Ohm 1/4 Watt 100-2330

R11 180 Ohm 1/4 Watt 100-2180

R12 3.3k Ohms 1/4 Watt 100-3330

R13 10k Ohm 1/2 Watt 101-4100

R14 100k Ohm, Potentiometer 105-1341

R19-22 51 Ohm, 2 Watt, 103-2151-1

PC 15-18 100 Ohm, 2 Watt 103-2180

RL1 12 VDC Relay 408-6140

S1A Wafer Switch 500-4811

S1B Band Switch 500-2811

S2 Rocker Switch w/Light 507-1157

S3, 4 SPST Switch 507-1147

S5 Safety Interlock Switch 504-3247

T1 Power Transformer 406-1532

T2 Neutralizing Transformer 10-14194-H

V1, 2, 3, 4 811A Tube 350-0811C

F1 12 Amp (120 Vac Operation) 755-1412

11

F2 8 Amp (240 Vac Operation) 755-1432