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Thread: Tonight's Amplifier Will Be

  1. #21
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 35,762
    I'm Geoff.

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    Yes. I didn't mention the other speakers..................

  2. #22
    Join Date: May 2008

    Location: Surrey

    Posts: 6,120
    I'm Rob.

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    As a famous comedian said..."there's more"
    Buy Bose...And get your parking validated!.

  3. #23
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 35,762
    I'm Geoff.

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    Quote Originally Posted by walpurgis View Post
    Think I'll use the MingDa MC-9 TVC into a Monarchy Audio SM-70 Pro power amp and hook up the Tannoy Cheviot Mk.II's tonight. It's a great combo.
    Got it set up and warmed up. But there's distortion on one channel for some reason. I'll investigate!

  4. #24
    Join Date: Apr 2012

    Location: Southall, West London

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    I'm Geoff.

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    Quote Originally Posted by walpurgis View Post
    Got it set up and warmed up. But there's distortion on one channel for some reason. I'll investigate!
    Bugger! It's the SM-70 Pro power amp. Distorting on left channel and seems to be very hot above the power transformer rather than the heat sinks, as you would normally expect on a Class A amp. I've hardly used this since having a dodgy tranny replaced.

    I'll have to check it over. Maybe swap over the output from secondaries and see if the issue swaps channels.

    Got the basic SM-70 rigged up instead. Sounds very fine.

  5. #25
    Join Date: May 2008

    Location: Surrey

    Posts: 6,120
    I'm Rob.

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    Bummer. I have been de-bugging a JLH 10w Dual Mono Class A I built some years ago, over the last couple of days as the L channel kept blowing the PCB fuse. Fixed the board and then had smoke from the L channel PS rectifier board! So I am now rebuilding that. R channel is fine.

    Hope you get it sorted.
    Buy Bose...And get your parking validated!.

  6. #26
    Join Date: Feb 2014

    Location: Huntingdonshire

    Posts: 1,413
    I'm Andrew.

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    Quote Originally Posted by Puffin View Post
    As a famous comedian said..."there's more"
    And thats one for the kids!

  7. #27
    Join Date: Sep 2009

    Location: Bournemouth

    Posts: 4,327
    I'm Dan.

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    Quote Originally Posted by walpurgis View Post
    Bugger! It's the SM-70 Pro power amp. Distorting on left channel and seems to be very hot above the power transformer rather than the heat sinks, as you would normally expect on a Class A amp. I've hardly used this since having a dodgy tranny replaced.

    I'll have to check it over. Maybe swap over the output from secondaries and see if the issue swaps channels.

    Got the basic SM-70 rigged up instead. Sounds very fine.
    Sorry to hear this Geoff Hope you get it sorted...
    Main System
    Musical Fidelity E100 Amplifier & Tannoy 615 MK2 Speakers & Rotel RD-945 Cassette Deck & Cambridge Interconnects & QED Speaker Cable , Arcam Alpha 7SE ,
    Vinyl :
    Rega Planar 2 / RB250 / Ortofon OM Super 10 / VDH Oil Bearing Upgrade / Roksan R Mat

    Second System
    Quad 34 Pre Amp FM 4 Tuner & 303 Power Amp & Pioneer PDS 703 Modded & Celestion Ditton 15 Speakers - Turntable Yet Decided on...

  8. #28
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 35,762
    I'm Geoff.

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    Quote Originally Posted by dantheman91 View Post
    Sorry to hear this Geoff Hope you get it sorted...
    Think I've tracked down a suitable transformer, but I'll check it over before ordering bits. Just wondering if a decent SMPS could be an option. Need to locate my multimeters now. Not seen them for a year or two.

  9. #29
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 45,273
    I'm Grant.

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    I will use the Amps I always use coz that's all Ive got.

    Good to here you have an idea what's wrong Geoff
    Regards,
    Grant ....

    I've said it before and I'll say it again: democracy simply-doesn't-work
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  10. #30
    Join Date: Apr 2012

    Location: Southall, West London

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    I'm Geoff.

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    Quote Originally Posted by struth View Post
    Good to here you have an idea what's wrong Geoff
    I've a fair idea mate. I'll try sorting it myself. I've enough others to use, so not stuck.

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