Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Madison on August 17, 2013, 02:53:09 am

Title: Guyatone Reverb Combo GA-1030 - mystery tube
Post by: Madison on August 17, 2013, 02:53:09 am

Have this on the bench.
The tremolo driver tube is a 9 pin.
J85 0305 with "467" painted on the side of it.

Got the amp working fine but just wondered about this tube.
An 12at7 variant?

Amp is a Princeton copy, diode driven, with 2xEL84s and a Pioneer speaker.
Pretty cool actually.

No, I don't have a schematic on this one.Figured it out though.

Title: Re: Guyatone Reverb Combo GA-1030 - mystery tube
Post by: eleventeen on August 17, 2013, 01:48:36 pm

Boy, tell me that silverface Fender front panel doesn't look like a Fender! (to these old eyes)

Title: Re: Guyatone Reverb Combo GA-1030 - mystery tube
Post by: Willabe on August 17, 2013, 01:58:45 pm

Quote from: eleventeen on August 17, 2013, 01:48:36 pm

Boy, tell me that silverface Fender front panel doesn't look like a Fender! (to these old eyes)

Looks like a SF drip edge Fender to me.     :icon_biggrin:

Quote from: Madison on August 17, 2013, 02:53:09 am

Got the amp working fine.

No, I don't have a schematic on this one. Figured it out though.

Cool! Good job!   


               Brad      :icon_biggrin: