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Looks like an Expo channel kit. 2 Crystals and the 2 trimmer capacitors are the giveaway. Typically used to give an additional 40 channels to the standard factory configuration. Either + 40 or -40 would be the choices. http://www.cbtricks.com/miscellaneous/vco/expo/model_a.htm...

AudioShockwav is a keyboard speedster!:giggle: 73 David

Looks like Audio is pin 1, ground is pin 2 and TX switching is pin 4. 73 David

There are Sh%t heads on the amateur bands as well-but they tend to have better equipment. 73 David (My own personal opinion/observations after 50 years in radio!) Now, let the flaming begin.:ROFLMAO:

Better chance of repair success to replace the relay. The Apollo amp is an old relic. The relay has probably been cleaned many times. But, cleaned correctly? I have seen folks take a bit of sandpaper or other coarse object to relay contacts and foul them up royally. Best to drag a damp piece...

Lkaskel I'm not sure if either of these 2 will help, but this is what I have on the Turner +2. 73 David

A large value resistor (1.5mega Ohm 1/2w or so) in line with the audio output of the microphone would be a good place to start. Even better would be to use a large value variable resistor in the microphone base and adjust as required/needed. I use the same amp/mic board on my Kenwood TS440...

The schematic calls out Q1 as an NPN transistor and Q2 as a PNP. Swapping to the correct (2N3906) transistor in the Q2 position may well solve your problem. 73 David

What is 15Ga wire? I have always seen and heard of wire in EVEN numbers-6, 8. 10, 12 etc. Maybe I have been sleeping under a rock for too long. 73 David

I have begun a restoration on a Yaesu FL2100B and am wondering if I can add a 3 conductor power cord to this unit for safety reasons. It will be wired for 120vAC operation. Attached is the power supply schematic for your browsing. 73 David

I have one. It works well. I have also made a few for new Hams. 73 David

Have you tried checking your SWR between the radio and amplifier terminated in a dummy load on Ch. 1, Ch. 20 & Ch. 40? 73 David

Then reduce the drive power to the amp and/or have the amp repaired. 73 David

The transformer you linked would be sufficient for the filament voltage of the 2 driver tubes( @ .6a per tube, the 2 amp secondary is more than enough headroom). As you can see from the schematic (attached), the driver filament voltage comes from a secondary of the main transformer. If I...

A separate filament transformer is one way to do it. Each 20LF6 draws .6a filament current. Six of them would need 4.2a from the transformer minimum- 5.0a would be better. Fitting another transformer into that chassis would be much more trouble than adding a 25-30w resistor on the underside of...

I would do whatever I could to knock down the filament voltage to 18-22 volts. I believe there is a post by @nomadradio addressing this in the thread. (Adding a resistor in series with the filament voltage wiring is the best way as 27LF6 tubes would be impossible to find now) The owner of this...

I did perform the mod below (copied and pasted from ???) to mine and it did wake up the SSB audio. No channels, no NPC, no RWOB, no other mods and radio performs great. Cut trace on PC board between Pin 1 of IC6 and pin 2 of IC4 ( MB3756 ). Next, install a .1uf mylar capacitor at C136 and a...

I have one. After removing the (required(?) blue meter LED) and making repairs to eliminate the Golden Screwdriver hacks, it works quite well with great receive and clear transmit audio. Not a power monster and was never meant to be. The only modification it has (now) is an unlocked clarifier...

Lucas is why the British like warm beer. Lucas also made refrigerators. 73 David

It will work. Most of these type power supplies have an adjustment potentiometer to set voltage level. Obtaining 14.5 volts DC output should be no problem. 73 David