Airline (Valco) GIM-9131A

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Airline (Valco) GIM-9131A

Postby Bigsbyman on Wed Aug 30, 2017 10:09 pm

I just acquired an old Airline (Valco) GIM-9131 amp head, the seller said that it has not been used since the 1980's. I've wanted a Valco/Supro/Airline amp for many years, and this one might work for me. It's loaded with RCA tubes, runs on a pair of cathode biased 6L6GC tubes, and has diode rectifiers. I'm hoping it's a good low-fi, grungy, retro-sounding amp.

My question is, can I simply plug this in and try it out, or should I power it up slowly on a variac?

-t
'64 JMI Vox AC30 with original alnico blues, '72 JMP 50-watt w/4x12 Greenbacks, '76 Lead & Bass combo (tan 25-watt Celestions), '76 Superlead with TV 4x12 (greenbacks), '78 2204 with Marshall 2x12 cab (Greenbacks), '78 Hylight DR504/SA4123, '79 Fawn 2204 50-watt w/matching Fawn 4x12 (tan 25-watt Celestions), 1970's Marshall 1982AP cabinet (black back 30-watt Celestions), Matchless D/C-30, Traynor, Garnet, Leslie, Bacino, Gibson, Fender, Gretsch, Rickenbacker, Trussart, Dano, Dobro

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Re: Airline (Valco) GIM-9131A

Postby JJman on Thu Aug 31, 2017 12:01 am

The SS rectification will slam the caps if you don't use a variac. More so if you already have the standby in play mode since the tubes will not be ready to conduct causing the voltages to be even higher. Using the variac with the standby in play mode the 1st time is a good idea. That way if a cap blows you can stop and prevent more from blowing. Changing the filter caps 1st is a better idea.
-If it says "Vintage" on it, it isn't.
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Re: Airline (Valco) GIM-9131A

Postby stratele52 on Thu Aug 31, 2017 8:59 am

No variac , you can use a 100 watts bulb lamp in series with wall outlet plug. In series, not in paralell.
I use it often

This will power amp safely as a current limiter

http://www.bristolwatch.com/load_lamp.htm

http://www.shulerent.com/2011/07/30/on- ... ent-meter/
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