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In Reply to: RE: Reissue GL or Psvane KT88 II posted by Michael Samra on June 14, 2016 at 22:51:52
The one place I can't get as much tone out out of new production power tubes are guitar/bass amps but it may have to do with how they break up etc. In a Ampeg SVT nothing seems to get near a GE 6550A. In a Marshall a Mullard, pre JJ Tesla or RTF el34 or GE 6550A. Maybe Fenderlover can weigh in if he has the same experience.For stereo though I agree although it's hard for me to pay so much as the Goldlion or etc without knowing if they have some added durability. A Electro Harmoinix 6CA7 in a amp such as a ST70 sounds mighty good to me and isn't priced at a premium.
Edits: 06/15/16Follow Ups:
The GE 6550A was designed for bass guitar amp service. It happens to be a pretty darned good HIFI tube too. St. Petersburg made 6550Cs were a somewhat tolerable substitute, but they too are "extinct".
The best suggestion I can make for bass guitar amp service is "reissue" GL KT88s and modify the units to include screen grid current limiting resistors. AFAIK, nothing else in this class of beam power tetrodes comes close to the GE 6550A in the g2 toughness dept.
Eli D.
Hi Eli, I usually just use Sovtek 6550we's. They seem to do okay and sound good but are no GE 6550A.
Are the screen grid current limiting resistors that you speak of 100ohm 1/2 watt resistors?
Thanks.
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