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Thread: Valve advice needed

  1. #1
    Join Date: May 2014

    Location: Solihull

    Posts: 529
    I'm Martin.

    Default Valve advice needed

    Hi All.................I recently mistakenly bought a NOS pair of Siemens PCC88 valves. I have some source items that use 6922 and /or E88CC
    One item is my Audiomeca CDP another is a SWIX DAC 1.
    How does the PCC88 differ and can it be substituted for the above
    Tangerine LP12,Naim Aro, Benz Wood
    Audiomeca Talisman Highly Modded
    Audiomeca Kreatura &,SW1X DAC1
    Hovland HP100 MC
    SiriuS D100
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    Quad FM4,RWA Cassabria + LCD 3
    Wilson Benesch Actors
    Cables by Cardas, Hovland G3 and Yter

  2. #2
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 5,078
    I'm Alan.

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    The PCC88 has a slightly higher heater voltage of 7.6V as opposed to 6.3V of the others.

    If you try it it will probably work to an extent but the heater will be under run and is not recommended.

  3. #3
    Join Date: May 2014

    Location: Solihull

    Posts: 529
    I'm Martin.

    Default

    Quote Originally Posted by Firebottle View Post
    The PCC88 has a slightly higher heater voltage of 7.6V as opposed to 6.3V of the others.

    If you try it it will probably work to an extent but the heater will be under run and is not recommended.
    Aha Thanks Alan
    Tangerine LP12,Naim Aro, Benz Wood
    Audiomeca Talisman Highly Modded
    Audiomeca Kreatura &,SW1X DAC1
    Hovland HP100 MC
    SiriuS D100
    Firebottle Monos
    Quad FM4,RWA Cassabria + LCD 3
    Wilson Benesch Actors
    Cables by Cardas, Hovland G3 and Yter

  4. #4
    Join Date: Jun 2015

    Location: London/Durham

    Posts: 3,068
    I'm Lawrence.

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    Quote Originally Posted by ovlov854 View Post
    Aha Thanks Alan
    Funny I've seen it said that this will prolong their lives! Although now I think about it, it's usually the sellers that say this!

    Sent from my POT-LX1 using Tapatalk

  5. #5
    Join Date: Apr 2016

    Location: Bishops Stortford

    Posts: 826
    I'm Chris.

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    Hi Martin
    If in doubt about the SW1X DAC I would drop Slawa an e mail - he may even recommend a substitute that can improve performance.
    SW1X Universal Music Server UMS I Signature with Power Supply Unit PSU I Signature
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    SW1X Open Baffle Speakers containing both vintage and modern alnico drivers and paper cones. All silver wired and crossover-less where possible - 4" vintage Siemens Klangfilm tweeters, 8" SEAS exotic W8 midrange drivers and vintage 15" Altec VOTT 416 bass drivers
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  6. #6
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 5,078
    I'm Alan.

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    Quote Originally Posted by Lawrence001 View Post
    Funny I've seen it said that this will prolong their lives! Although now I think about it, it's usually the sellers that say this!

    Sent from my POT-LX1 using Tapatalk
    Up to 10% is the maximum without affecting performance or spoiling the heater efficacy, so 7.6 - 10% = 6.84V. 6.3 is just too low.

  7. #7
    Join Date: May 2014

    Location: Solihull

    Posts: 529
    I'm Martin.

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    Quote Originally Posted by bumpy View Post
    Hi Martin
    If in doubt about the SW1X DAC I would drop Slawa an e mail - he may even recommend a substitute that can improve performance.
    Hi Chris
    Yes I did get in touch with Slawa and he did reccommend a heavyweight version of the Russian E88CC he supplies and I've got one.
    Only problem is that I mixed up the 2 of them and now I can't tell which is which


    I do have a number of 88 variants which I can use (currently a Brimar) but hoped to be able to use the PCC88 as a pair in my other CDP when my CrossedSwords Teslas give up
    I did find that the Russians were very detailed but overly bright for my taste
    Tangerine LP12,Naim Aro, Benz Wood
    Audiomeca Talisman Highly Modded
    Audiomeca Kreatura &,SW1X DAC1
    Hovland HP100 MC
    SiriuS D100
    Firebottle Monos
    Quad FM4,RWA Cassabria + LCD 3
    Wilson Benesch Actors
    Cables by Cardas, Hovland G3 and Yter

  8. #8
    Join Date: Oct 2016

    Location: London

    Posts: 149
    I'm David.

    Default

    Whatever the theory I've run PCC 88s on 6.3v perfectly satisfactorily for a long time circa 5 years with no ill effects. So if you've got a pair, and you like the sound what's not to like? You won't harm your equipment

    Sent from my ONEPLUS A5000 using Tapatalk

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