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FDP Forum / Fender Amps: Vintage (before 1985) / Is a '59 Bassman Different than a '60?

blakef

USA

Sep 28th, 2016 02:30 PM   Edit   Profile   Print Topic   Search Topic

I'm not understanding why the '59 seems to be revered. Is not a 5F6-A a 5F6-A? Is it just hype that '59 seems to be some magical year for Bassmans? I have a '60 and it seems to be the exact same as a '59.

carsten

on the rhine

Sep 28th, 2016 03:36 PM   Edit   Profile   Print Topic   Search Topic

Hi blakef!

I think a 5F6-A IS a 5F6-A - regardless of the actual year of manufacture.
It became famous as a "ยด59 Bassman" because it was released in 1959.

cheers - C.

Figaro

South Carolina

I kicked cancer's ass!
Nov 11th, 2016 06:42 PM   Edit   Profile   Print Topic   Search Topic

Fender changed the P10R speakers to P10Q in 1960 I think.

1958Bassman

USA

Nov 13th, 2016 10:16 AM   Edit   Profile   Print Topic   Search Topic

The last three years of Tweed had some inconsistencies and the speaker change, but they're basically the same. Premier Guitar recently posted a video showing (almost no information) about the '58 through '60 Bassman as the Holy Grail years.

I called Mercury Magnetics about the 8087 power transformer and was told that they weren't particularly consistent, for a variety of reasons. Also, the schematics show "All voltages +/- 20%", so that could explain many differences between specimens.

SoK66

USA

We had the hit but Van got the money
Dec 16th, 2016 09:44 PM   Edit   Profile   Print Topic   Search Topic

The 5F6-A was released in '58 actually. The earliest conform to the schematic, but somewhere soon after there were a few changes in the tone stack and Presence component values. The Reissue is actually pretty close to the 'real 59s in that respect.

1958Bassman

USA

Mar 5th, 2017 05:54 PM   Edit   Profile   Print Topic   Search Topic

Haven't been here lately, but I recently watched a video on YouTube of a '59 Bassman that has a .1uF cap in the tone stack where mine came with .02uF. Not sure what the difference in sound is, but....

Also, some amps came with a 10K resistor on the phase inverter (it's directly above the 32.5VDC test voltage shown on the diagram below), some came with 6800 Ohm resistor.

Hard to say at this point what the real difference is- I changed the 10K to 6800 and noticed more hiss but today, I found that one of the .02uF caps in the tone stack is leaky.

I also found that when the filter caps were changed, the two that are paralleled in the first node are each 40uF, which may explain the problems with short rectifier tube life and no sag.

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