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Thread: Pre amp matching

  1. #31
    Join Date: Dec 2014

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    Sorry if this has already been suggested, but if you bought the Glasshouse pre as a 'used' item it might be worth checking if a previous owner has adapted or fitted any pre-attenuation resistor set-up.

    I have a 50k stepped attenuator passive (not Glasshouse) and had no problems driving the 0.5v required for an SS power amp other than not being able to turn it past the first few steps without rattling the windows. To remedy this I needed to add a pre-attenuation set - using a guide offered on the Goldpoint website.

  2. #32
    Join Date: Dec 2012

    Location: Stoke on trent

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    Ok I've confirmed there is no issue with the passive pre.. .it sounds fantastic. So...basically the power amp sounds like it's in a reduced output set back mode. No distortion or anything like that. Sounds beautiful...just quiet. As it's both channels I'm wondering if it's the central valve rather than one of the output valves.

  3. #33
    Join Date: Apr 2012

    Location: N E Kent

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    Input impedance/sensitivity?

  4. #34
    Join Date: Dec 2012

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    I've heard off the designer who states that it needs a high gain pre amp as it is a 3v input sensitivity. Obviously that doesn't mean much to me... but it may explain things?

    How do I find a high gain pre amp?

  5. #35
    Join Date: Apr 2012

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    Quote Originally Posted by Bourney View Post
    How do I find a high gain pre amp?
    Quad?

    Or, I could lend you my Moth Series 30 to try. It sounds very good with my valve monos.

  6. #36
    Join Date: Apr 2008

    Location: Warrington

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    Quote Originally Posted by Bourney View Post
    I've heard off the designer who states that it needs a high gain pre amp as it is a 3v input sensitivity. Obviously that doesn't mean much to me... but it may explain things?

    How do I find a high gain pre amp?
    That is a very very low input sensitivity indeed. My amp is 0.4V input sensitivity!

    Bear in mind that the higher the preamp gain, the higher the noise and distortion, so it should still be kept as low as possible.
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  7. #37
    Join Date: Dec 2012

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    Thats great, thank you. Would a croft micro 25 do the job?

  8. #38
    Join Date: Sep 2009

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    i am not an expert but elite audio have a 12 month old vtl 2.5 which is 1295 on ebay and 1795 on their site !!

    it has adjustable gain

    https://vtl.com/products/preamplifiers/tl-2-5i/

    8dB or 14dB (user selectable)

    https://www.ebay.co.uk/itm/VTL-2-5i-...4AAOSwfoNaaKcE
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  9. #39
    Join Date: Mar 2011

    Location: Reading

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    Quote Originally Posted by Bourney View Post
    I've heard off the designer who states that it needs a high gain pre amp as it is a 3v input sensitivity. Obviously that doesn't mean much to me... but it may explain things?

    How do I find a high gain pre amp?
    That certainly does explain it and of course, passive preamps are not feasible. Oddly enough all the amps on their web page including the Evolution 2 (300B) all have reasonable sensitivity. I assume it is an older model. Going for an active preamp means the world is your shell-like. Valve or SS? Budget? etc...

  10. #40
    Join Date: Dec 2012

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    Around £600 max really as I was originally planning to use it with the £165 glasshouse! Thinking Croft 25 unless sonething tasty comes along at a bargain price.

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