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Re: [Amps] Revival advice

To: Matt <>, Amps group <>
Subject: Re: [Amps] Revival advice
From: Jim Garland <>
Date: Sat, 31 Mar 2018 09:40:30 -0600
List-post: <>
That's a nice old amp, Matt. I wouldn't worry about the tubes. The Svetlana tubes are well-built and should power right up. That said, it's probably not a bad idea to cook them with filament and HV,( but no drive) for a few hours before applying RF. That should also drive out any residual moisture from the plate transformer.

SInce you've replaced the caps already, the only routine maintenance is to lubricate the fan bearings, clean the bandswitch and relay contacts, and veryify that the line cord is in good shape.

As I recall, the amp doesn't have a tuned input, so I hope you're driving it with a vacuum tube exciter that won't worry about the input VSWR.


Jim W8ZR

On 3/30/2018 9:14 PM, Matt wrote:
I am in need of some amp revival advice.   I have a 1st generation Gonset
GSB201 that I want to restart.   I have not put power to it since 2008 when
I replaced the power supply caps.   It worked fine at that time.   Since
then the amp & myself have moved cross country with the amp stored for years
in a semi-conditioned (no humidity control) environment.   The tubes are the
older model Svetlana 811As (with anode heat sinks) last replaced about
2002ish and have low hours.   I also have the set of well used RCAs that I
pulled in 2002.    I have the amp at home now in a full conditioned
environment and thought I would let it set there for a week or so to dry out
in the event something inside soaked up some of that humidity.

Should I bring it up on the old RCAs since I understand it's hard to get
good replacement tubes?

Should I/can I use a Variac to bring it up slowly without having to do
disconnect anything inside the amp?

If I get it up to HV, how long do I need to heat the anodes to activate the
gettering process?  The amp has no internal shutoff bias so it normally
flows anode current at idle.

Anything else I should be aware of?

Many thanks for advice!




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