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FDP Forum / Fender Amps: Vintage (before 1985) / Brown Pro info and transformer question

Roy Earl

west coast USA

Feb 7th, 2012 12:33 PM   Edit   Profile   Print Topic   Search Topic

Have a chance to buy a clean brown Pro. have only seen pics and gotten the details over the phone thus far.
It is a 6G5 then the A added in ink. Original owner's kid is selling it. can not make out the date code on the tube chart as it was really not applied well and no way to discern it.
But it has the following transformers in it, which a couple of them do not jibe with the SVVA site chart. I was curious if anyone could offer some input on the transformers which are in it:
Power-67233 date code: 606112
Choke-125C1A date code: 606117
Output-45217 date code: 606117

now the choke lists as correct but the power and output transformers do not list as 'correct' if one goes strictly by the book and we know that Fender did not always do that. but neither power or output transformer types were those stated to be used in the tweed Pros either. the power and output transformers appear to be what you would find in an early brown bandmaster combo. correct?
the dates are consistent and the history of ownership suggests to me that this was maybe Fender just screwing around with transformer configurations and that it probably is factory.
the Oxford speaker is 15M6-1 465-123
serial number 03752
oh, this also has the oxblood grill on it.
is it safe to assume this is a 61. volume control is Not center. should I worry much about the trannys not matching? thanks for any input.

mickkotter

gretna, la

Feb 7th, 2012 12:57 PM   Edit   Profile   Print Topic   Search Topic

roy;

consulting my transformer lists i can confirm your observations:


67233 Power Transformer

Bandmaster 6G7A
Concert 6G12
Showman 6G14
Twin 6G8

125C1A Choke

Lotso' amps including the Pro 6G5A

45217 Output

Bandmaster 6G7A
Tremolux 6G9,6G9A
Vibrolux 6G11
Vibroverb 6G16



Roy Earl

west coast USA

Feb 7th, 2012 02:31 PM   Edit   Profile   Print Topic   Search Topic

If I assume by the speaker date that this amp was at the earliest a July 61 amp I can more or less theorize that with what we know about Fender doing strange transitional things during this period, that it is not impossible for them to have used this combination. Every power transformer I am seeing though on these Pros has been a 125P7A. the SVAA guide even gets that one wrong by a letter saying it's a 125P7D. strange transformer layout if one goes by what is usually found in these Pros. I might well jump on this one.

Roy Earl

west coast USA

Feb 7th, 2012 02:50 PM   Edit   Profile   Print Topic   Search Topic

I am finding that the transformer data chart is lacking comprehensive info to say the least. I was just looking at past auctions. here is a 1960 brown which has an identical transformer configuration (link below). So this layout was used on some early Pros apparently, but seems to be most prevalent with the early 5 preamp tube configuration non-A circuit. This one has the early transformer layout and the 6 preamp tube 'A' circuit with the sweet vibrato. I think knowing these transformers have been in the early browns in security enough for me to take a leap on this Pro.

1960 pro which sold last year

mickkotter

gretna, la

Feb 7th, 2012 05:15 PM   Edit   Profile   Print Topic   Search Topic

my '62 pro 6G5 (wheat grill) has the set of transformers typically listed in those transformer lists.

at least those older transformers are still there and presumably working.

also, rest assured if CV owned that 1960 amp (sold last year),
then it was an amp to own.

(This message was last edited by mickkotter at 05:17 PM, Feb 7th, 2012)

Roy Earl

west coast USA

Feb 7th, 2012 07:15 PM   Edit   Profile   Print Topic   Search Topic

i noticed he owned it and was a nice amp. surprised it sold so low!

centervolume

USA

thank you sir, may I have another
Feb 10th, 2012 06:25 PM   Edit   Profile   Print Topic   Search Topic

hi guys-
yeah definitely a buyer's market. That guy actually resold a few months later and took a loss!I got near 2K, I was happy with that given the situation.

All those 5 preamp tube models from 1960 had the 67233 PT.

Saw the thread on Roy's concert. I was toying with mine last couple of. I was able to save 2 original cones with rubber cement surrounds. Little rips in paper sound like a blown coil.

MikeyV

CA, USA

Aug 20th, 2013 11:49 AM   Edit   Profile   Print Topic   Search Topic

I recently got into an Oct 1960 Brown Vibrasonic.

Looking at the eBay sale above, I noticed some interesting things:

That Pro has a date stamp of JH, Aug, 1960. It's got the Tweed style grille cloth. the seller mentions that between June and Oct of 1960, when the combination of Brown face, Pink tolex, tweed style grille, and regular control layout was available.

Looking at my Vibrasonic, It's got a tube chart stamp of JJ, Oct 1960. It sports the pink tolex, 6G13 (not 13-A) circuit, Maroon Grille Cloth (for sure original) and the regular volume first control layout, and the 6 tube 12AX7 pre-amp layout.

Such an interesting time in the history of fender. Seems that by October, they had switched to the Maroon grille (without the gold stipes), but had not yet gone to the 6G13-A curcuit layout.

These brown amps truely are transitional, and each one could be almost unique, given the pace of change and experimentation.

:)

SoK66
Contributing Member
*****

USA

We had the hit but Van got the money
Aug 21st, 2013 09:35 PM   Edit   Profile   Print Topic   Search Topic

Would just toss in that the brown Bandmaster/Concert/Pro amps can occasionally have a chassis spec'd for one of the other two amps. My '61 Bandmaster is actually by circuit a Pro (has the single cap bias circuit). Leo apparently just used whatever he had built and swapped faceplates, cabs, etc pretty much at will.

FDP Forum / Fender Amps: Vintage (before 1985) / Brown Pro info and transformer question




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