Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: shooter on March 14, 2016, 08:37:45 pm

Title: another skylark
Post by: shooter on March 14, 2016, 08:37:45 pm

 acquired this from a starving musician :icon_biggrin:  Very clean, plays well, just needs the 2 dead bee guts cleaned off, and scratchy pots cleaned.  Gonna spec it against the schematic and see where it's at.  Way better than the last 3 I fixed!  It's the odd one, 6EU7, 6C4, and interstage tranny PI

Title: Re: another skylark
Post by: eleventeen on March 14, 2016, 08:46:48 pm

Clean little dude. Did the others you looked at have those radial (PC mount) caps or do you think those new(ish)?

Title: Re: another skylark
Post by: PRR on March 14, 2016, 08:57:39 pm

> do you think those new

You can see the rivet holes where the old flex-lead strap-mount caps were removed.

Still don't believe that can be a Gibson. I can almost read the whole circuit at a glance. Where is the messy maze?

Title: Re: another skylark
Post by: pullshocks on March 14, 2016, 09:34:45 pm

I always have liked the looks of Gibson amps from that era

Title: Re: another skylark
Post by: shooter on March 15, 2016, 08:44:15 am

Quote

Where is the messy maze?

:l2:  You are right, when I opened it, I was amazed, The other 3 I worked on looked like my early spaghetti days!  All the wires, soldering, components,  looks *original*, except the cap-3prong mod.

Title: Re: another skylark
Post by: sluckey on March 15, 2016, 09:26:11 am

Here's the schematic for the "whiteface" GA5T in case you don't have it. They can be hard to find...

Title: Re: another skylark
Post by: Ed_Chambley on March 15, 2016, 11:31:47 am

I love those little amps and this one looks nice.  Original speaker still working well?

Title: Re: another skylark
Post by: shooter on March 15, 2016, 12:43:11 pm

Thanks Steve, ya, it took me like 4days of surfing last year when that model came in.  I was fascinated with the tranny PI, so I bought one and incorporated it into my last build, way less parts to solder :icon_biggrin:

The speaker sounds good, I think this amp just sat in a closet for along time.

Title: Re: another skylark
Post by: shooter on March 15, 2016, 03:48:37 pm

Here's the info I got from the amp, still need to tension sockets, and the bass pot won't cleanup, but it only scratches when you turn it :icon_biggrin:

EDIT: I did change the time-base on the scope, no weirdness on the OT :icon_biggrin: