|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
2.106.16.211
In Reply to: RE: Agreed. Value is high with the JJ. nt. posted by RC Daniel on November 24, 2014 at 19:26:07
after all the fuss about their pentodes' reliability.
Observe, before you think. Think before you open your yap. Act on the basis of experience.
Follow Ups:
... that concerns about reliability are justified. Mine have pins that are too large diameter and are a bit rough; the bases seem loose. The tube matching specs are not as detailed as EML, but I guess that is fine for the price. You would probably be OK if you got them from someone who checks and tests thoroughly.I just received my EML 2A3 solid plates... I don't know how long they take to burn in or even if they need to... or whether I will enjoy them in the longer term. But, they make me want to get all funky without the enhanced yet mildly soft bass and highlighted sibilance of the JJs. I have also been able to adjust hum lower than with other tubes (~2mV and ~1mV noise with AC fils - not bad), but the pot positions are quite different to the EML 2A3Ms (I would not entrust hum mitigation to CT transformers alone - tubes vary too much!). These EML 2A3-S tubes could become my daily drives - in my amp they should last for a very long time!
Cheers.
"In the beginner's mind there are many possibilities, in the expert's mind there are few." Shunryo Suzuki
Edits: 11/26/14 11/26/14 11/26/14 11/26/14
My understanding is that they are JJ 300Bs with the 300B 5v filament folded for the 2.5v and bang, you're a 2A3. So running them at 2A3 points they will last a long time.
But I have also heard that most current production 2A3s are really 300Bs, so IDK...
And it may be true for SOME Russian tubes, or some Chinese tubes but I don't think it applies to ALL 2A3 tubes because I have as pair of 2.5V 300B's which were sold as 300B's and the same firm made 2A3's and claimed that the tubes were completely different regards operating points.That said I HAVE run Russian 2A3's in my 300B amps (which I build with both 5V DC filaments as well as an optional 2.5V AC filament supply) and they did not sound bad. J.C.Morrison of New Sensor said they would not last long as the cathodes were not made to be run at 300B operating points.
Edits: 11/26/14
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: