Re: [Drakelist] TR-7 Question

Dave - T/R problems are often associated with the 10R and 10T control lines and their fuses, Q306 and Q307. Check both busses, marked on the parent board traces. Each must be very close to +10 when receiving or transmitting respectively AND very close to 0V inversely. You'll probably find

[Drakelist] WTB TR-3

Looking for a clean, working TR-3.  I have the power supply.  Don't need a cream puff just working with a good face plate and if the case needs paint that's OK also. Dennis       n5dpk ex kw5g ___ Drakelist mailing list

[Drakelist] Need function switch or switch wafers for T4X

Hi-I am trying to help a friend finish his T4X. The function switch needs to be replaced as it has bad wafers. Anyone have a spare or a junker rig with a good switch? Thanks in advance and 73 Lew KlNDV___ Drakelist mailing list Drakelist@zerobeat.net

[Drakelist] Fw: TR-7 Question

Garey (and also Don who suggested the same), I pulled the bottom cover and checked the 10R and 10T lines. They are working correctly. I measured 9.9V on the 10R line in receive and 0.00 in transmit. I measured 0.0V on 10T in receive and 9.9V in transmit. Any other suggestions? Dave

Re: [Drakelist] Fw: TR-7 Question

Dave - OK, you gotta start somewhere! :-) The AF Preamp stage, Q1113 on the 2nd IF/ AF board gets it's B+ from the 10R line coming in on Pin 11/14. So if you have 0V on that stage, then the AF signal that you are hearing in the speaker when transmitting is getting into the audio stages via

Re: [Drakelist] R-4C Notch alignment question

Darrell - First, the S9 +30 signal should be at zero beat for the null to be at 12 o'clock. Generally not worth fighting, as not only is the adjustment difficult to access, it's also glued down. Unless that glue blob is broken, indicating someone has been fixing it, it will be close enough.