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Im still trying to chase this down. have replaced the relay, the modulation transformer, v700, and v701. I still have a stray shock of output, before the little spike in voltage that happens at keyup.

I checked my other tram d201 it also has a little spike on ssb keyup. I noticed when i purchased the problem tram that the L 700 air duct, had been cut and resoldered missing 2 coils. When i looked online i found a picture of the mod on another post . I think it supposed to increase ssb. Im...

I followed the spike when i key up on ssb from v701 pin #4. mod. B+ to the orange wire coming from the t600 transformer. it also spikes on the white wire from the transformer. The resistors dont seem to stop the spike going to v701 pin#4. Im wondering if the t600 is bad, or can something else...

Thanks Dmans , I swapped out the final tube it still spikes on keyup so i put the newer one back in. i also checked the rf driver.

Thanks Dman, I swapped out the relay, but its still spiking. Its transmitting the spike to my watt meter on ssb, and am but i do not hear anything on the monitor radio during the spike. The watt meter spikes to about 15 watts on ssb, then settles on zero. then it has good modulation. on am it...

i found the spike is on am also. It looks like its causing a full power spike on the watt meter.

Thanks Dmans Here is another photo. I also read about the orange diamond logo being on the first hand wired version but it looks like its also on some second pc board versions of the d201. ( there is one for sale on ebay with the orange diamond 12/31, it also does not have assembled in Mexico...

I read that some of the d201 second version was assembled in the USA.One of my tram d201 has a silver front logo. it does not have assembled in mexico on the back but the tram with the black logo does. Hmm

I swapped out the relay. but, no change. I noticed when i key the relay engages, then the needle spikes hesitates and then it appears to throw the needle back toward zero.

Thanks Nomadradio, I checked the c706. it was almost all the way tight clockwise from the back of the chassis. so i turned it out ccw ftbc about one turn. It didnt change or stop the spike. but It did bring up the output. i have not found the date on the relay it looks like it may have been...

I swapped out the microphone but there was no change.

I found the R429 s meter adjustment is not adjusting.

It noticed that on am it will also spike when i key. then it shows the right readings. I monitored the signal spike i could not hear any squeal or noise when it spikes I tried another microphone but no change. how can i check to see if the receive is disconnecting before the transmit connects?

When i key on ssb the meter will spike and then flutter before the meter settles on zero. it appears to transmit fine after the spike and flutter. With the watt meter hooked up the output also spikes beyond 12 watts and then returns to zero when i key up. I have swapped out the v401 and v602...

I found it! tube v502, I have some extra tubes from replacing them all so i swapped out one at a time starting with v500 and found it was a bad 6gh8a.

Thank you, for the replies. i will check the, v500, v501 and v502 tubes. I love the tube sound.

The hum can be squelched out by turning up the squelch knob.

replaced power trim pot r427 it works great.

There is a hum in ssb receive. i have replaced the four C624 capacitors, the c5 can and c517. Im stumped

Okay, thanks Nomadradio thats interesting.