Mullard PM202 tube - is it as good as a 300B?
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  1. #1
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    Mullard PM202 tube - is it as good as a 300B?

    If I use a Mullard PM202 tube instead of a 300B - is it feasible - and is there a downside? Thank you in anticipation.

  2. #2
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    Re: Mullard PM202 tube - is it as good as a 300B?

    https://www.radiomuseum.org/tubes/tube_pm202.html

    I don’t know but it looks like a different or not compatible tube.
    Joe

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  4. #3
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    Re: Mullard PM202 tube - is it as good as a 300B?

    Is the Mullard CV185 the same, effectively, as the PM202? I can see these offered as old stock - the ad says:British Mullard Mullard CV185 Direct Thermal Triode 300B Push Tube

    Are they not being truthful as an alterantive to the 300b?? Thanks!

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    Re: Mullard PM202 tube - is it as good as a 300B?

    Hi Joe - sorry to bother you - can you help me with the following please?

    Is the Mullard CV185 the same, effectively, as the PM202? I can see these offered as old stock - the ad says:British Mullard Mullard CV185 Direct Thermal Triode 300B Push Tube

    Are they not being truthful as an alterantive to the 300b?? Thanks!

  6. #5
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    Re: Mullard PM202 tube - is it as good as a 300B?

    Hi,

    I’m so sorry but my tube knowledge is very limited. I only know the basics of some of the most popular tubes.

    I hope you can contact some of the major tube sellers and ask for their help.

    I honestly don’t know enough to give you a proper answer. I don’t ever remember seeing that there ever was a suitable replacement for 300B tubes.
    Joe

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  7. #6
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    Re: Mullard PM202 tube - is it as good as a 300B?

    The PM202 and CV185 are basically the same tube and are interchangeable.
    They have a 2 volt filament and were designed for usage with batteries.
    The 300B has a 5 volt filament.
    Those tubes (pm202/cv185) will not work in place of a 300b.
    Besides the filament voltage differences there are many other specifications that are not compatible.
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  9. #7
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    Re: Mullard PM202 tube - is it as good as a 300B?

    Many thanks, Joe! I presently live in China - and am taking the opportunities presented... So many tube amps here - and so many sellers of NOS tubes. Sadly, I know little about specs. other than I see NOS 300b in a description - and am immediately tempted. Best wishes and thanks again.

  10. #8
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    Re: Mullard PM202 tube - is it as good as a 300B?

    Many thanks! You saved me a few dollars! Best wishes.

  11. #9
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    Re: Mullard PM202 tube - is it as good as a 300B?

    We are happy to help. I am glad we saved you from making a few mistakes. There’s so much that I need to learn that it seems overwhelming.
    Joe

    Avantgarde Duo XD, Klipsch RB-75, Klipsch RP-160M, JBL 590.

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    Misho Myronov Wooden amp, First Watt SIT-3 (X2 - one as backup), Job 250 Monos, Valvet E2se, NuForce STA200, AkitikA GT-102 amp, ASL Wave monos, Dennis Had 45 monos.

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