Just brought one of the two CE 100V exciter/transmitters that I bought from Andy WA2CDL’s estate sale last year up and running.  So far so good, seems to be working well
overall.  However, opposite sideband suppression could be a bit better.  I’ve tried the procedure in the manual to tweak the balanced modulator audio ratio and balance pots which has improved things a lot but I’ve run out of pot adjustment at the stops. The manual says for future improvement , adjustment of the 8 Mc oscillator phase coils is required.  So, how to proceed with that?  Tweak each one a little at a time and then fine tune with the pots?  Before I start tweaking the coils should I put the pots back approximately mid span where they were before I tweaked them?
 
BTW, the full carrier AM mode performance of the 100V is pretty good, have been using it to drive the CE 600L to 100 watts carrier output.

Talking with Howard, W3HM last year about some issues with my 32V2 revealed some easy repairs. For by-pass caps he uses the polystyrene jobbers that you can get about 50 for $10. Where micas were used he replaced with ceramic discs. I have a couple micas that were showing almost a dead short. Don't be afraid to use what your common sense tells you. Unless you want to maintain 'factory mint' with everything as built you will probably have a difficult time finding those components and with their age they will probably have a high failure rate when you do find them.

1) Central Electronics 200V
This transmitter is in good condition physically except for missing scope but is untested & may need some electronic refurb.

2) Central Electronics 100V
This transmitter is in good condition physically but is untested & may need some electronic refurb. No cabinet.

These are pick-up at my QTH in Hamilton, OH or meet up. No shipping due to weight. I can meet at Hamvention in May or within reasonable distance of Hamilton, Ohio.

$200 each or Best Offer.

Threaded my way through the POTA SSB and had a lovely chat with John, G3YPZ on 21.420 yesterday around noon.
Things are brewing ... give a listen.

W7NGA

Did you check the Junk folder in your email client for the password reset emails?

Harvey Wells R9A receiver & T90 transmitter With matching power supply.

These units are in good to very good physical condition. They are from SK estate. They both powered up (slowly with variac). I did no further testing. The units may need some electronic refurb.

These are pick-up or meet up only due to weight. I can meet at Hamvention May 17-19, at the Greene County Fairgrounds or within reasonable distance of Hamilton, Ohio.

SEE PICS HERE:
https://antiqueradios.com/forums/viewtopic.php?t=437525

$250

The AVX type MLCC (multi layer chip capacitor) are favoured by the class E folks here as well as RF designers all over.  MRI, plasma generators, etc.  Other than the form factor, they’re a better than original replacement for silver mica.  Although uncommon/more expensive, they can be ordered with tabs or strips as well, which would make using them in place of leaded components easier.

Ed

Those caps have great electrical specs for RF use.  That being said these may be hard to use in recapping as the parts are not leaded but rather intended for surface mount PCB use.

I am in the process of replacing all the silver mica caps in the A4 with 500V dipped SM caps.  Obtained the needed parts from Tube Depot and Digi-Key


I just posted on another topic about the input transformer T2 in the 75A4 I am working on.  For reasons unknown it looks like the input (antenna side) winding had been removed.  Trying to get a good picture of what a "stock " one looks like to try and restore it.

Joe
WA1IWQ 

Hi Folks,

In the process of debugging low sensitivity on 75M on a 75A4 receiver I found that the input transformer T2 for that band had been reworked and the primary winding removed.  Looking for a good picture and/or any info for this transformer so I can try to restore it

Was recently running the MUTT in the field on RTTY and voice, posted a video over on the tube at:

https://www.youtube.com/watch?v=kLxH3j8mzYs

Will have the MUTT in operation at Hagerstown MVPA show next weekend and maybe we can include some AM activity? The AN/GRC-106 will do a fake AM by transmitting USB plus carrier.