Just ordered 2x Tesla E88C tubes from ebay. Price was too good, but I hope that they are not fake. https://www.ebay.com/itm/E88CC-Tesl...e=STRK:MEBIDX:IT&_trksid=p2060353.m2749.l2649 . Maybe someone can compare them with EH 6CG7 ?
Vali 2 tube rolling
- Thread starter Capt369
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fnsnyc
100+ Head-Fier
Did anyone else have a microphonics issue with the Vali?
Every time something touches the Vali, or the headphone cord pulls it a little, I hear a ringing noise.
Every time something touches the Vali, or the headphone cord pulls it a little, I hear a ringing noise.
bcowen
Headphoneus Supremus
The microphonics are not attributable to the Vali -- they're attributable to the tube. Try a different one.
Even with a pair of identical tubes, one can exhibit microphonics and the other is totally stable. When buying tubes it is always best to purchase those which have been tested and the results listed. Tube dampers (eBay) can be very helpful for controlling microphonics. They are silicone 'donuts' which fit on the envelope.
Here's a great site to learn all about tube stuff: www.audiotubes.com
Here's a great site to learn all about tube stuff: www.audiotubes.com
riffrafff
1000+ Head-Fier
bcowen
Headphoneus Supremus
LOL! Go big or go home.
Wow. That's a difficult question. Read through this thread for lots of ideas. If you don't mind getting an adapter, a Foton 6N3P is a great choice that's pretty cheap. If you don't want to mess with adapters, my favorite un-adapted tube in the Vali was a 60's vintage Telefunken 6DJ8. Gotta be careful with those too though as that family has a high tendency for microphonics. If you can find a good one though it will sing.
riffrafff
1000+ Head-Fier
Yeah, I'm taking baby steps, workin' my way up:
I need to look into those dual-tube adapters (that use two single-triode tubes) just for fun.
timb5881
1000+ Head-Fier
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Back into Tube Rolling hog heaven! Got my 12au7 to 6922 adapter in today. Right now jamming with a Ei 12AU7 silver plate tube, very nice indeed.
Keno18
Member of the Trade: NY Talent Media
Just listening to a 12ax7 Electro-Harmionix, darker than the 12au7, deeper bass but still well controlled. Out of the 13 tubes I've rolled the EH 12ax7 and 12au7 are my favorites.
timb5881
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What brand of 12AU7? So far I have tried in the 12au7 family Tung-Sol, RCA Black rib (5693), Ei silver plates and Mullard. I like the RCA and the Tung-Sol the best.
One of my favorite tubes is a clear top, side getter, RCA/CONN 12AU7 from the early 1960s. It is warmly vivid in the mids and top and the bass is solid and expansive. The Chicago Symphony really sounds like the CSO.
Luckily, these tubes are readily available and don't cost an arm, leg, first born, or left nut.
Luckily, these tubes are readily available and don't cost an arm, leg, first born, or left nut.
Keno18
Member of the Trade: NY Talent Media
Electro-Harmonix. I've tried RCA clear tops, bright but not enough bass; Raytheon (Japan) Yellow label, dull sounding; Sylvania 5814a Triple Mica, all -round good just not quite as good as the EHs. I've been meaning to try the Tung-Sols as I like their 6sn7. After my last post I gave another listen to the 12au7EH vs. 12ax7, the 12au7 had better sound stage and imaging with slightly less bass impact but I prefer the EH.
@Lekoguy I just read your post about the clear tops, They were my favorite with the Bravo V2, I stockpiled 13 of them just to be sure I had enough
. Every so often I go back to them with the Vali.
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