Oktava MKL2500 tube replacement - which tube will work?

[Michael_Joly]

I bought some N.O.S. 6AK5 tubes made by CBS-Hytron (made in Danvers, MA) from www.tubestore.com that work fine.

[qbert1]

Thanks, I'll look into that. By the way, do your mods work on a Chinese 2500? I'm pretty sure mine is a "fake", but I'm still curious if there's more potential within.

BK

[DPSM]

Originally Posted by qbert1

Does anyone know where I can find a replacement tube for this mic? Mine's going bad. Websites tell me its a 6C315P tube, but there seems to be no info or availability. Is there a equivalent number I should look up? If I can eventually find a replacement, what brand would be a good match?

I can do the intermediary job for ordering any tubes/synths/parts originated in Russia.
See also additional info at:

PPG Wave Servicing

[Bassmankr]

Try a google search for mods, I remember seeing some sites with stuff posted about this mic but I don't have the link(s) for you. There is also info on how to tell the Chinese from the Russian ones, GC sold both with Chinese power supplies. I picked up two of them and luckily got the Russian mics (different tubes in each though LOL) but have yet to mod them. If your mic has noise, check the voltage switch on the power supply (120v/220v), they mounted them opposite the silk screening on the case, what the red switch is showing is right.

[qbert1]

I'm pretty positive it's "fake" and thanks to the wonders of the interwebs, it's also hum free now. Would some of the 319 mods work for this one too?

[Wavebourn]

No such a tube exist. It is 6Zh1P (6Ж1П Cyrillic), complete replacement for 6AK5.

http://www.omnipressor.com/other/oth...L2500schem.jpg

[woomanmoomin]

http://www.soundonsound.com/sos/oct0...avamkl2500.htm

The above article does mention the 6C315P valve, but I get the feeling something has been lost in translation at some point in the past and that the result (the name '6C315P') is now being quoted as standard. Hopefully the actual valve type will be a common one...

Anatoliy, is there anything like a 6SZ15R? (I guess not.) I guess that would be Cyrillic 6C315P.

[Wavebourn]

Originally Posted by woomanmoomin

http://www.soundonsound.com/sos/oct0...avamkl2500.htm

The above article does mention the 6C315P valve, but I get the feeling something has been lost in translation at some point in the past and that the result (the name '6C315P') is now being quoted as standard. Hopefully the actual valve type will be a common one...

Anatoliy, is there anything like a 6SZ15R? (I guess not.) I guess that would be Cyrillic 6C315P.

No.

Cyrrillic Zh looks like >-|-< that most probably could be "translated" into set of some familiar Latin characters.
Such letter after the 1'st number (rounded filament voltage, 6.3V) means "Pentode". Cyrillic "C" (sounds as "S") means triode.
P at the end means "Miniature, finger type", 7 or 9 pin.
R at the end does not exist.


The mic uses 6Zh1P (or may be pronounced as 6J1P) tube that is exactly 6AK5. If you need 6Zh1P I have some, but you may buy it on ePay like I did.

http://cgi.ebay.com/6J1P-EV-LOT-OF-1...mZ180087375503

[sekim]

BTW - the 5654 is a premium grade 6ak5 if you want to give it a try. Both are plentiful and cheap on eBay...