Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: TubeGeek on July 26, 2016, 12:19:53 am

Title: 1962 6G7-A Blonde Bandmaster on the bench
Post by: TubeGeek on July 26, 2016, 12:19:53 am

This amp came in this past weekend.  Pretty nice one.


Here are some pics...

Title: Re: 1962 6G7-A Blonde Bandmaster on the bench
Post by: TubeGeek on July 26, 2016, 12:21:42 am

I just opened it up tonight and let the owner know what he has.  He is quite happy and gave me instructions to do what I would do, if it were my personal amp.

Title: Re: 1962 6G7-A Blonde Bandmaster on the bench
Post by: TubeGeek on July 26, 2016, 12:26:54 am

It clearly has had some previous work done.  I haven't planned what I am doing yet but I have a few ideas.

Title: Re: 1962 6G7-A Blonde Bandmaster on the bench
Post by: HommeMarrBuckley on July 26, 2016, 08:27:08 am

Nice! Excellent condition.
That speaker cab have the tone ring? Maybe a member can remark about their usefulness.
Owner just want a basic service job?

Title: Re: 1962 6G7-A Blonde Bandmaster on the bench
Post by: sluckey on July 26, 2016, 08:38:40 am

Check out the vibrato on that amp. I bet you'll really like it.

Title: Re: 1962 6G7-A Blonde Bandmaster on the bench
Post by: TubeGeek on July 26, 2016, 10:00:05 am

Quote from: HommeMarrBuckley on July 26, 2016, 08:27:08 am

Nice! Excellent condition.
That speaker cab have the tone ring? Maybe a member can remark about their usefulness.
Owner just want a basic service job?

I haven't opened up the speaker cabinet yet but it looks like it has a tone ring in it.  It is a 15" speaker too.  I'll open that up tonight and maybe even play her for a bit. edit...it turned out to be a 12M6 Oxford actually.


The owner has asked me to do a full servicing on it.  I'll go through and verify all the new components are correct and not mods, replace the original electrolytics, replace the 2 prong power cord and check the bias. I doubt it'll need much more than that.

I am considering a few things for the coupling caps....either leave them as is, replace the xicon's with my stash of blue molded caps so it's back to original, or install new orange drop's.  I'm gonna chew on that for a bit. There is no big rush on this job.  I get time to really study this amp.

Title: Re: 1962 6G7-A Blonde Bandmaster on the bench
Post by: pompeiisneaks on July 26, 2016, 01:26:22 pm

WoW! that's a super clean looking amp.  I'm betting it won't need much more than a cap job. 

Very cool to get to work on such a beaut!

~Phil

Title: Re: 1962 6G7-A Blonde Bandmaster on the bench
Post by: drew on July 26, 2016, 03:17:25 pm

Somebody put those Xicon brown turds in it, but left the original electrolytics?   :dontknow: 

Title: Re: 1962 6G7-A Blonde Bandmaster on the bench
Post by: TubeGeek on July 26, 2016, 03:19:58 pm

Quote from: drew on July 26, 2016, 03:17:25 pm

Somebody put those Xicon brown turds in it, but left the original electrolytics?   :dontknow:

Yeah kinda left me scratching my head too.


They did replace the cathode bypass capacitors though.

Title: Re: 1962 6G7-A Blonde Bandmaster on the bench
Post by: TubeGeek on July 26, 2016, 03:23:21 pm

What impressed me was the amperex bugle boy and tung-sol preamp tubes and rca 5881's.  The silk screening on the bugle boy's is fantastic and the best I have ever see intact.

Title: Re: 1962 6G7-A Blonde Bandmaster on the bench
Post by: TubeGeek on July 30, 2016, 09:06:37 pm

Opened the cabinet today and it is actually a 12" speaker.  It just looked larger than a 12" through the grill cloth.  It is the tone ring that threw me off there.


The speaker is a 12M6 Oxford.  465-138.  Which dates to 38th week of 1961 I think.


This tone ring is pretty cool. First time seeing one in person.