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In Reply to: RE: New, old amp posted by FenderLover on March 29, 2017 at 06:43:01
I rebuilt a very similar vintage Gibson Skylark for a friend. 12AU7 front end into the interstage transformer driving a pair of EL84s.
The thing that plagues some Gibson amps of this era is their use of T-filters (part of me thinks that's the wrong name) for tone shaping. The theory I've heard is that with the era of the jangly, bright guitar, Gibson wanted to make amps that made their darker-sounding guitars sound sparkly. The result is that many of these mid-60s Gibsons can sound very odd, unless you delete or modify these filters.
What do ppl do to the tone stack to fix tone shaping issues? Mod them or replace with another type of stack?
"What do ppl do to the tone stack to fix tone shaping issues? Mod them or replace with another type of stack?"
People do either, depending on the particular amp and/or the final sound they want.
On the Skylark, for example, I added a resistor between the ground of the filter and the circuit ground to reduce its effect.
In other words, these mid-60s Gibson amps have good cabinets, transformers, and decent speakers, and the weird tone-shaping can be remedied fairly easily.
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