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Re: Substiting 6h30pi for 6n1?

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In Reply to: Substiting 6h30pi for 6n1? posted by DanTana on March 23, 2005 at 10:28:04:

I've read numerous posts about 6922/6dj8 vs 6n1 but none about substituting the 6h30pi for 6n1. Is this a closer match than the 6922 for 6n1
No - it's quite different. Has the same base but it has higher heater consumption (.9 for .6) and could damage your equipment. If your heater circuit can stand it it may actually sound better in some circuits, but you'd need to know how and why before swapping such things.
and also...would putting in a 6922 for a 6n1 be less harmful than trying to put a 6n1 where a 6922 was?
Yes - less heater current, same base. should substitute. However, I've known 6922 to be unstable where 6N1P is fine. this may be unlikely but such things are possible

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Re: Substituting 6h30pi for 6n1? - DanTana 11:48:01 03/23/05 (6)
Thanks for the reply Andy,
So IF my circuit can handle .9 vs .6 amps current draw then otherwise I COULD swap the 6h30pi "super tube" for the 6n1p? And as far as the 6922 for the 6n1p that should be a drop-in? Just clarifying things as I'm not that knowledgable about these yet.
This is for a Ming-Da MC34B amp btw. I've already swapped the socket for the preamp from 6n2 to 12ax7, which cured most of the brightness and have some new Mullard EL34's and JJ 12ax7's on order. I'd really like to try out that "super tube" and see what all the commotions about.
Thanks.
- 6h30 has half the gain, too remember. (nt) - zarniwoop 15:36:50 03/23/05 (0)
  nt
- Well... can you swap a 10k resistor in your circuit for a 1k one? - Victor Khomenko 13:30:17 03/23/05 (4)
  That is the same kind of question.
  Those tubes are substantially different, with electical parameters different by an almost order of magnitude.
  So... yes, in some case you can, just like the resistor swap in the header, in others, when the circuit requires a particular tube, you can't.
  A wrong tube might not even bias properly in some circuits, and the overall circuit parameters will change too. The 6N1 is quite whimpy, the 6H30 opens up at much, much higher currents, and your circuit might not be able to supply those.
  - Re: Well... can you swap a 10k resistor in your circuit for a 1k one? - DanTana 19:35:58 03/23/05 (3)
    I'll have to pop the hood again and look inside, I also wrote Meixing for a schematic for the MC34-B amp and hopefully they'll send me one.
    I received those "new" Mullard EL34's today and JJ Tesla 12ax7's for it and it sounds great.
    - Substituting 6h30pi for 6n1p - DanTana 03:52:45 03/24/05 (2)
      I didn't realize you were being sarcastic in that title...lol. Ok, I'm slow. I guess what I'm looking for is the ability to upgrade the 6n1p tube and with all the hype now about the 6h30pi, it seemed like the next logical step up. I guess what I really wanted to know is if I can just pop that tube in place of the 6n1p without blowing up anything? I wrote Meixing about the amperage draw, I haven't heard back yet from them. Hopefully they are looking it over now :)
      - Re: Substituting 6h30pi for 6n1p - Victor Khomenko 06:05:28 03/24/05 (1)
        
        In Reply to: Substituting 6h30pi for 6n1p posted by DanTana on March 24, 2005 at 03:52:45:
        
        Wasn't really sarcastic, more the statement to the fact that in most cases a particular device is selected based on its unique properties, and thus a blind substitute is not usually good idea, especially when parameters differ by such a great margin.
        Just the word of caution. Yes, many circuits could be changed to accomodate the larger and much more powerful tube (kinda like putting a V8 in a small car...) but should be done with knowledge and proper analysis.
        
        Re: Substituting 6h30pi for 6n1p - DanTana 13:05:25 03/24/05 (0)
        
        In Reply to: Re: Substituting 6h30pi for 6n1p posted by Victor Khomenko on March 24, 2005 at 06:05:28:
        
        Here's the reply I received from Tim Yuen :
        Dear Dan,
        
        Please DO NOT, and I repeat DO NOT change any tubes other than their approved equivalent. You are going to destroy this amp by doing that. Same pinout means nothing as this amp is designed in accordance with the parameters of certain tubes.
        
        If you are interested to use that particular Russian tube, you should research circuit(s) designed for that Russian tube. I don't have info related to that tube.
        
        Sorry you have to get the schematic from the dealer you buy this amp from. If you can't find it elsewhere, I can sell it to you at a small cost. If you buy the amp from me, I can find that for you at no cost. I am extremely busy and I have to take care of a lot of service issues on a daily basis, therefore I have to cover my service cost but some I can provide at no cost.
        
        Thanks for your understanding,
        Tim

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