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Oktava MKL2500 tube replacement - which tube will work?
Old 22nd February 2007
  #1
Gear Head
 

Thread Starter
Oktava MKL2500 tube replacement - which tube will work?

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?
Old 22nd February 2007
  #2
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Michael_Joly's Avatar
 

I bought some N.O.S. 6AK5 tubes made by CBS-Hytron (made in Danvers, MA) from www.tubestore.com that work fine.
Old 22nd February 2007
  #3
Gear Head
 

Thread Starter
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
Old 22nd February 2007
  #4
Gear interested
 

Quote:
Originally Posted by qbert1 View Post
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:

https://www.gearslutz.com/board/geekslutz-forum/93078-ppg-wave-servicing.html
Old 23rd February 2007
  #5
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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.
Old 23rd February 2007
  #6
Gear Head
 

Thread Starter
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?
Old 23rd February 2007
  #7
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Old 23rd February 2007
  #8
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woomanmoomin's Avatar
 

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.
Old 23rd February 2007
  #9
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Wavebourn's Avatar
 

Quote:
Originally Posted by woomanmoomin View Post
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
Old 23rd February 2007
  #10
Gear addict
 

BTW - the 5654 is a premium grade 6ak5 if you want to give it a try. Both are plentiful and cheap on eBay...
Old 9th January 2017
  #11
Did a tube swap on mine. Be aware not easy to do. Tube not in a socket. Wires connect to pins directly. Had to attach wires to pins and then splice them. Not fun!
Old 10th January 2017
  #12
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Quote:
Originally Posted by Ardis View Post
Did a tube swap on mine. Be aware not easy to do. Tube not in a socket. Wires connect to pins directly. Had to attach wires to pins and then splice them. Not fun!
Yeah I've done that too. No picnic.
Old 10th January 2017
  #13
Quote:
Originally Posted by Ragan View Post
Yeah I've done that too. No picnic.
Yeah I've got a strange intermittent fluttery sound in the tube and hoping it's not going bad. Mr Joly recommended running the tube for 3 days to see if that straightens it out. I really don't want to replace it again! The guy I used basically attached the wires to the new tube and then spliced the wires to the existing ones.

Amazing how small the wires are inside the mics. I wonder sometimes when I hear of people spending a kings ransom on cabling. I wonder what kind of Russian wire is in these! (Probably don't want to know!)
Old 10th January 2017
  #14
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Ragan's Avatar
 

Quote:
Originally Posted by Ardis View Post
Yeah I've got a strange intermittent fluttery sound in the tube and hoping it's not going bad. Mr Joly recommended running the tube for 3 days to see if that straightens it out. I really don't want to replace it again! The guy I used basically attached the wires to the new tube and then spliced the wires to the existing ones.

Amazing how small the wires are inside the mics. I wonder sometimes when I hear of people spending a kings ransom on cabling. I wonder what kind of Russian wire is in these! (Probably don't want to know!)
Yeah that's a whole nother can of insane worms, the cable thing.

I got several tubes from Bowie and a couple of them were small enough that I was able to put a tube socket in the 2500. A very tight fit, height wise, but it did work.
Old 10th January 2017
  #15
I should have gotten a tube from Bowie, completely spaced on that. Got mine from a seemingly reputable tube source. Dumb of me not to have thought of him!
Old 10th January 2017
  #16
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Ragan's Avatar
 

Quote:
Originally Posted by Ardis View Post
I should have gotten a tube from Bowie, completely spaced on that. Got mine from a seemingly reputable tube source. Dumb of me not to have thought of him!
He is the man, that's for sure.
Old 16th January 2017
  #17
Old 10th March 2017
  #20
Gear Head
 

Why does the mfg charge so much for this tube?



Hello we can replace the tube in your 2500 microphone but
unfortunately it is expensive, the tube is $75 and the service is $125.
I do have 2 brand new MKL-2500 microphones (mic only) for $225
if that might work for you.

Best,


President
Oktava USA
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