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Discussion in 'Effects [BG]' started by kranahan, Oct 9, 2020.
Here’s the gut shots from my old Edison.
For what its worth Ive had mine out to two loud rehearsals, and the very mild microphonics mine has was not an issue (granted I had mine on full time). My drummer noticed enough to inquire what changes I hade made to my pedal board.
I didnt know Edison was starved plate (is it?). EDIT: Do those small caps are answer the question?
Note only two, in line, plastic standoffs supporting the board. Not rigid (in this case a good thing).
Yup, Edison runs the plate at 27V.
Probably more of a factor than the mounting arrangement?
Is the microphonnicness mitigated at lower voltages? Maybe that’s one reason why the Edison is only 30V?
Microphonics are still present at lower voltages, they're just more evident with higher output level. Microphonics are inherent to the tube, not the circuit.
Goofed around to see if I could make the board more clear.
The "get something else" is more what I was suggesting.
Can you set up two of your WH, one with an EF86, then another with a different tube, whether it be a 12AU7 or whatever, and A/B them, while adjusting the voltage to the non-EF86 one, to see if another tube can approach a similar tonality that you're getting with the EF86 equipped WH @235V?
I mean I could try something, but EF86 is a pentode and the 12A*7 series are triodes, anything I try would sound different. Honestly I think Space Heater with the gain rolled back would be about as close as you can get with a triode-based preamp, but the character is still different.
Are there other small pentodes you could try?
There are always a few bottles of togarashi in my kitchen. The secret to edamame!
I mean there are literally hundreds of different varieties of sharp cutoff pentodes, it would just be about finding one that has similar curves and responds similarly. With the prevalence of EF86 in Vox and Matchless amplifiers, if there was a good replacement out there that sounded as good, I would be curious why they aren't using it. I'll look around, but that will take a considerable amount of reading and likely won't happen right away as I have other things that demand my attention.
I guess purchasing a tube dampener ring would be a good idea
How about a highly viscous oil bath?
I don't know enough about tubes to know if my op was ignorant in some way. I'm assuming from your response I shouldn't do it and/or a ring wouldn't do much?
I intend to get some dampener rings to try out and see if they help. Highly viscous oil bath would be fine, make sure you seal the box beforehand as it isn't currently sealed. Make sure the oil is non conductive as there are high voltages present.
I had no idea the oil bath was a thing. I thought it was a joke. Researching now
Pretty sure it was a joke, but that doesn't mean it wouldn't work
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