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Thread: OTL amp owners

  1. #41
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    Quote Originally Posted by bonzo75 View Post
    Did you hear any on stats, Andrew?

    I had my Silvaweld OTLs on my Acoustat 1+1 and it sounded heavenly...but hotter than hell!
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  2. #42
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    Quote Originally Posted by microstrip View Post
    Although not fully class A - no true tube OTL of significant power can be class A when using your speakers - the MA-2 is biased at 1.2A - much more than common class A/B tube or SS amplifier. It is what was called a very enriched class A/B amplifier, most of time working in class A.

    Why going for an expensive and hard to get tube (the 6C33) when you can use the well sounding, cheap, reliable and safe 6AS7?

    6C33Cs are cheap and plentiful in fact.
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  3. #43
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    Quote Originally Posted by Ron Resnick View Post
    I see that the Tenor 75 OTL used 6C33C tubes!

    I think I rest my case (Joule Electra and Tenor) that for some reason the 6C33C OTL amps sound less lean than the 6SN7 OTL amps.
    You mean 6AS7 I think Ron. 6SN7 is a small signal tube (input and driver). Atmasphere uses the 6AS7. Einstein and Graaf also used 6C33C and are not lush sounding...
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  4. #44
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    Quote Originally Posted by morricab View Post
    6C33Cs are cheap and plentiful in fact.
    Yes, but unfortunately very unreliable, particularly for OTL's that ask for high peak currents. Graaf users (as me), know well about it.
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  5. #45
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    Quote Originally Posted by morricab View Post
    You mean 6AS7 I think Ron. 6SN7 is a small signal tube (input and driver). Atmasphere uses the 6AS7. Einstein and Graaf also used 6C33C and are not lush sounding...
    Yes, thank you.

    Oh well, there goes that theory.
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  6. #46
    Site Founder And Administrator Ron Resnick's Avatar
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    I talked with Ralph today, and he was very patient and informative and very helpful. Ralph thinks that the sound of the Novacron and the sound of the M-60 are very similar. If anything, he said, the M-60 might be slightly sweeter on the top end.

    He fully rejected my theory of any consistent sonic difference between 6C33C output tubes and 6AS7 output tubes.

    I suggested to him that, since virtually everybody loves the crystalline transparency of OTL, there are only three possible reasons why not every tube-preferring audiophile in the world uses his amplifiers: 1) cost, 2) speaker incompatibility or 3) preference for the rounded, more bloomy sound of output transformer-coupled tube amplifiers, over the neutrality of Ralph's OTL amplifiers.

    Ralph pretty much agreed with this and added that he simply has no interest in the warmer colouration imparted by output transformers.
    Mono and Stereo - Senior Contributing Reviewer

    turntable: American Sound AS-2000; tonearms: SME 3012R, Schröder LT; cartridges: ZYX UNIverse Premium X-SB2, Air Tight Opus-1; tape: Studer A820 Mk II; phono stage: Aesthetix Io Eclipse with 2 power supplies; line stage: VTL TL-7.5 Series III; amplifier: VTL Siegfried Series II; loudspeaker: Gryphon Pendragon; cables: MasterBuilt Ultra; stands: Herzan + Taiko Tana + Evo LPS for Io, custom for turntable, Stacore Basic+ for amps; power: Benjamin Electric subpanel, JPS in-wall wire, Furutech NCF outlets, Torus AVR60BAL; room: 19' wide X 24' long X 14' tall; acoustic treatment: SoundSense A.T.I. + Lumitex drapes + Vibramat, ASC IsoThermal Tube Traps; tweaks: Shakti Stones, Shun Mooks, self-propelled sound-absorbing cocker-poo

  7. #47
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    Quote Originally Posted by bonzo75 View Post
    Do you have a pic of the horns? Was it like a voice of theatre design?
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  8. #48
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    "An audiophile is only done when they go to the great brick and mortar store in the sky"

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  9. #49
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    Thanks Ron

    Great feedback and summary

    Maybe add, and heat is another issue, especially a lot of 6c33, and warm climates like Australia , having said that I am in Canberra where the heat is often welcome

    ......”
    I talked with Ralph today, and he was very patient and informative and very helpful. Ralph thinks that the sound of the Novacron and the sound of the M-60 are very similar. If anything, he said, the M-60 might be slightly sweeter on the top end.

    He fully rejected my theory of any consistent sonic difference between 6C33C output tubes and 6AS7 output tubes.

    I suggested to him that, since virtually everybody loves the crystalline transparency of OTL, there are only three possible reasons why not every tube-preferring audiophile in the world uses his amplifiers: 1) cost, 2) speaker incompatibility or 3) preference for the rounded, more bloomy sound of output transformer-coupled tube amplifiers, over the neutrality of Ralph's OTL amplifiers.

    Ralph pretty much agreed with this and added that he simply has no interest in the warmer colouration imparted by output transformers.”
    "An audiophile is only done when they go to the great brick and mortar store in the sky"

    [/B]

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