Lafayette Comstat 25b

[Night Crawler]

What is Deoxit? were can you find it?

Radio Shack has it.

[sandy7]

I have 2 Comstat 35's and a Colt Midnight Special.
Decades ago I owned a Comstat 25A.
They all have similar chassis and are only slightly different from you 25B.

Things I have found that effect solid reception/transmission on these rigs.

Internal shorts in tubes
dirty/loose tube sockets
dirty contacts on xmit/recv relay
dirty contacts on PA/CB selector switch
crystals loose in crystal sockets
headphone jack contacts dirty resulting in no audio at speaker
radio left in "standby" mode (squelch turned all the way to the left)
tired capacitors
substitute tube numbers used with marginal results
tubes mixed up in wrong sockets
damaged coil tuning slugs
worn/tired switches and pots.
damaged rear power cord.
chassis surface rust affecting ground points
radio designed to run on 110-115 vac, today's house voltage between 120-125vac resulting in rig running hot.

Good luck!
When they run they have great xmit and recv audio, better than most run of the mill solid state rigs.
I prefer using the Turner +2 with these rigs. At one time I wired up a Lafayette EchoVerb II in between the radio
and a microphone with a separate PTT switch, allowing me to use just about any good quality microphone with
a 1/4 inch phone jack.

Steve

[dime196604]

I have 2 Comstat 35's and a Colt Midnight Special.
Decades ago I owned a Comstat 25A.
They all have similar chassis and are only slightly different from you 25B.

Things I have found that effect solid reception/transmission on these rigs.

Internal shorts in tubes
dirty/loose tube sockets
dirty contacts on xmit/recv relay
dirty contacts on PA/CB selector switch
crystals loose in crystal sockets
headphone jack contacts dirty resulting in no audio at speaker
radio left in "standby" mode (squelch turned all the way to the left)
tired capacitors
substitute tube numbers used with marginal results
tubes mixed up in wrong sockets
damaged coil tuning slugs
worn/tired switches and pots.
damaged rear power cord.
chassis surface rust affecting ground points
radio designed to run on 110-115 vac, today's house voltage between 120-125vac resulting in rig running hot.

Good luck!
When they run they have great xmit and recv audio, better than most run of the mill solid state rigs.
I prefer using the Turner +2 with these rigs. At one time I wired up a Lafayette EchoVerb II in between the radio
and a microphone with a separate PTT switch, allowing me to use just about any good quality microphone with
a 1/4 inch phone jack.

Steve

i'm thinking my problem is with the channel selector some where, there is one point on it and when ever it comes into contact the channel cuts out, i know what channels don't work and what positions on the selector don't work, so i just gotta go from there with some more trial and error

[The Shadow]

What are the dead channels? It might be a bad crystal. Check the crystal mixing chart and see if the dead channels all have one crystal in common. If so, that's probably your problem and not the switch. In my experience it's uncommon for more than one switch contact to be bad.

Terry