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Post subject: Bandmaster Silverface with AB763 circuit
Posted: Mon Mar 28, 2011 1:07 am
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I am considering to buy this head and I wonder if there's an easy way to verify his claim that this is a Silverface head with the original Blackface circuit?

http://www.dba.dk/guitartop-fender-bandmaste/id-72729585/

thanks

JimR


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Post subject: Re: Bandmaster Silverface with AB763 circuit
Posted: Mon Mar 28, 2011 1:28 am
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Possibly. These particular amps (with the vertical blackline front panel markings and the drip-edge molding around the grill cloth) were made from mid-1967 until December of 1968. However, the circuit for these Bandmasters was changed in mid-68 from the AB763 revision (ie: blackface) to the AC568. Thus, the change-over occured in May. You'd need to inspect the inside of the chassis for an ink-stamped date adjacent to the power transformer and/or the biasing circuit. The stamped date codes on the three transformers could also be used to determine the vintage. As well, most silverface AB763 Bandmasters that I've examined have had the cloth-insulated wiring within the chassis -- all of the AC568's had the later neoprene-jacketed wiring inside. If you can get a serial number you can correlate it to data found here......

http://www.superiormusic.com/page195.htm

HTH

Arjay

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Post subject: Re: Bandmaster Silverface with AB763 circuit
Posted: Mon Mar 28, 2011 2:06 am
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Thanks, I have sent him a mail for the serial - I can feel some serious GAS coming up...

With a 2x12" cab (possibly Cannabis Rex) I would be a happy (not ice) picker!

JimR


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Post subject: Re: Bandmaster Silverface with AB763 circuit
Posted: Mon Mar 28, 2011 2:09 am
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Indeed!

Bandmasters also sound tasty with Celestion V30's......very punchy.

Arjay

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Post subject: Re: Bandmaster Silverface with AB763 circuit
Posted: Mon Mar 28, 2011 11:35 am
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These pics should help... the tube chart should also say AB763.

Image

Image


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Post subject: Re: Bandmaster Silverface with AB763 circuit
Posted: Mon Mar 28, 2011 12:36 pm
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Seems that a couple of components have already been changed :) .

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Post subject: Re: Bandmaster Silverface with AB763 circuit
Posted: Mon Mar 28, 2011 11:51 pm
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Hmm, it has serial A293xx which places it in the group with both the blackface and the silverface circuits:

Bandmaster AB763, AC568 (silverface)
A26000 to A29000 - 1967
A28000 to A34000 - 1968
A33000 to A34000 - 1969
A34000 to A45000 - 1970-72

I'll have to check the insides of it then.

JimR


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Post subject: Re: Bandmaster Silverface with AB763 circuit
Posted: Mon Mar 28, 2011 11:55 pm
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If you can manage some photos of the chassis interior and the transformers, that would be vital to determining the amp's pedigree and its originality.

Arjay

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Post subject: Re: Bandmaster Silverface with AB763 circuit
Posted: Tue Mar 29, 2011 7:22 am
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Interesting, my TRRI also has the AB763 circuit according to the the tube sticker.

JimR


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Post subject: Re: Bandmaster Silverface with AB763 circuit
Posted: Tue Mar 29, 2011 9:52 am
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The TRRI is, in a sense, an AB763 circuit. The fundamental difference is the change from point-to-point wiring to a PCB, just as with the other blackface re-issues (excepting the PRRI). In any case, the principal reason for tube charts is to enable the user/owner to change tubes when the occasion demands. The circuit identification is of secondary import.

Arjay

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Post subject: Re: Bandmaster Silverface with AB763 circuit
Posted: Wed Mar 30, 2011 9:16 pm
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JimDane wrote:
Hmm, it has serial A293xx which places it in the group with both the blackface and the silverface circuits:

Bandmaster AB763, AC568 (silverface)
A26000 to A29000 - 1967
A28000 to A34000 - 1968
A33000 to A34000 - 1969
A34000 to A45000 - 1970-72

I'll have to check the insides of it then.

JimR


notice they messed up the number cutoffs from 68 tot he begining of 69.
68 probably should go from 29000 to 33000 I assume


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Post subject: Re: Bandmaster Silverface with AB763 circuit
Posted: Wed Mar 30, 2011 10:26 pm
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mxvin wrote:
notice they messed up the number cutoffs from 68 tot he begining of 69.
68 probably should go from 29000 to 33000 I assume


Indeed, there are some discrepancies regarding assigned serial number blocks for several late '60s models. When in doubt, other cues should be noted (ink-stamped chassis dates, EIA tranny codes, type of wiring, etc).

Arjay

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Post subject: Re: Bandmaster Silverface with AB763 circuit
Posted: Thu Mar 31, 2011 5:26 am
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Retroverbial wrote:
mxvin wrote:
notice they messed up the number cutoffs from 68 tot he begining of 69.
68 probably should go from 29000 to 33000 I assume


Indeed, there are some discrepancies regarding assigned serial number blocks for several late '60s models. When in doubt, other cues should be noted (ink-stamped chassis dates, EIA tranny codes, type of wiring, etc).

Arjay

No doubt RJ. I posted this because I must have looked at those serial number blocks a hundred times for BMR (since i am always on the hunt for a deal) and never noticed until the other day that the numbers were a tad off.
Ur right though.....you need to check the trannies, pots, stamps, anything with EIA code that can help determine date or year of mfg.


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Post subject: Re: Bandmaster Silverface with AB763 circuit
Posted: Sun Apr 03, 2011 1:22 pm
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alot of silver face amps have the incorrect tube chart they kept using the old charts. I have read that the black lines on the silverface ended in June of 1968. I have a black line 1968 bandmaster how much is it in US dollars I just bought mine about 3 month ago for $300.00 us and had it checked out by a amp guy in Chicago he said it is a non-modded AB763 some of the caps are changed and the tubes are new but it sounds great so if it wasn't a AB763 I wouldn't care. here is a pic of mine the cab is mid 90s
Image


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Post subject: Re: Bandmaster Silverface with AB763 circuit
Posted: Sun Apr 03, 2011 3:53 pm
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vinnyg wrote:
I have read that the black lines on the silverface ended in June of 1968.


I've seen a very few blackline silverface amps that dated to January of 1969 -- none have been Bandmasters though (all were combos, with the drip-edge molding).

That's a sharp looking rig, Vinny!

Arjay

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