DIODE IN B+ LINE FROM MOD XFORMER TO PA

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DMOD:
Quote from: ka1tdq on September 22, 2018, 01:05:55 PM

I'm bringing an Elmac A-54H back to life and it now has a pulse. I replaced the germanium diode with a new 1kv/3A one. Everything else is the same, including the 33k resistor on the secondary of the mod transformer.

I'm hearing ringing from the mod transformer. Maybe the ringing you mentioned in this post Phil? Elmac put a "PA on/off" switch on the front panel to short out the secondary windings for off times, and the pitch varies when I change the switch position.

I haven't tried modulating the rig yet. I had to remove lots of weird "mods" done to the rig. Too much to go into, but I really don't know what this guy was thinking.

Jon


This guy has some suggestions as well for upgrades:

http://www.crompton.com/hamradio/oldradio/a54.html

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