Tram D201A No carrier, am modulation good

[troyota]

Well here we go again. After the SSB receive is finally working for a day or 2. Now I have lost the AM carrier. However, it will still modulate 20 watts. I have 0 power/modulation on LSB or USB. Before this happened AM transmit worked good. I had a 5 watt carrier on am and 20 watts modulation. I only had about 5 watts modulation on SSB. I have tried another BA and BM board with no luck. I have noticed the last few days the noise floor was really quiet, but would still pull out the weak receive signals. I checked with my Yaesu 990 and sure enough it would hear the signal but had quite a bit of normal white noise. Turn the switch to the D201a, no white noise but the signals were still coming in. Anyway, not a real issue I just thought it may be related? Oh, BTW the receive has not been affected with the vacation of transmit. (for now anyway)
Thanks

 

[wavrider]

Should be several bias resistors, check those to see if they are still somewhat close to the values they should be.

 

[nomadradio]

The manual is split into several smaller files. This one has alignment instructions. At the top of page 47, ignore step 1. Steps 3, 4 and 5 will probably reveal negative bias voltage way higher than they specify.

https://cbtricks.org/radios/tram/d201/graphics/tram_d201_om_pg33_pg50.pdf

That's what this sounds like, anyway.

73