Amp Internals 2 |
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valve head777
Old Croc Joined: 27 July 2012 Location: East Sussex Status: Offline Points: 1780 |
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Freedom of choice, choice of freedom.
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Dub Specialist Sound
Old Croc Joined: 15 November 2013 Location: Smethwick Status: Offline Points: 4873 |
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Very very nice valve man
i need to learn more about valve amps...
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Musical Roots Reggae Vibration is Life! for music is sound...sound is vibration...vibration is energy... and energy begets life. Therein lies my passion!...MUSIC IS LIFE...
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Earplug
Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7199 |
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Earplugs Are For Wimps!
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valve head777
Old Croc Joined: 27 July 2012 Location: East Sussex Status: Offline Points: 1780 |
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Freedom of choice, choice of freedom.
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shaun1264
Registered User Joined: 06 September 2013 Location: Surrey Status: Offline Points: 277 |
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Crown Macro Reference 1. Built December 1994 |
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doller
Young Croc Joined: 19 July 2014 Location: japan Status: Offline Points: 509 |
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Myths. To appreciate valve amplifier technology we must first be-bunk audiophile myths that in-correctly describe them. Many Audiophiles believe in alchemy and behave similar to religious cults. Cult driven audiophiles are easily identified by their repetitious chanting of brand names, model numbers and meaningless superlatives concocted by high priest reviewers and marketing spin doctors. The highest Deity worshiped by the occult .
Classic !!!!! never read that on an amp page before.
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flinnt45
Registered User Joined: 30 April 2013 Location: london Status: Offline Points: 111 |
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Hey Valve head
Do you know what the plate to plate impedance of the output transformers primary is? and what current output is the mains transformer rated for?, I have done a lot of research on this type of amp and I ask because some very interesting design concepts were used and the piece is probably capable of a lot more than 600 watts. |
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valve head777
Old Croc Joined: 27 July 2012 Location: East Sussex Status: Offline Points: 1780 |
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Freedom of choice, choice of freedom.
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flinnt45
Registered User Joined: 30 April 2013 Location: london Status: Offline Points: 111 |
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Hey valve head
Based on your information re the mains TX your amp is not what I would call an impedance tricker, I assume 750v @1,5 amps is what is available after rectification, prior to its about 2 amps and somewhere around 530v if full wave bridged, your tubes,s need 150ma a piece=1.8 amps plus a bit of headroom, so preferably 2.4 amps after rectification, I know that in push pull only half the tubes are on and half the tubes are off during operation and that's fine for a hi fi amp but at the crossover point all of the current is required and I suspect this may be why your amp modulates-it runs out of current, your primary impedance is somewhere around 750 ohms for the output TX,try to match your speaker loads on the secondary with this amp as I believe its designed this way, what you describe as saturation is the power supply causing distortion-classic overdrive, perhaps it was designed to give this over driven Bass sound-there is much more performance available from the amp as you describe it. I also assume that you have input, phase splitter, then cathode follower?, if not and its just an input tube then the phase splitter try swopping out the ecc81 for an 82. |
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valve head777
Old Croc Joined: 27 July 2012 Location: East Sussex Status: Offline Points: 1780 |
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Thanks for your input, would love to hear your setup too.
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Freedom of choice, choice of freedom.
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flinnt45
Registered User Joined: 30 April 2013 Location: london Status: Offline Points: 111 |
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Hey valve head
If I understand you correctly your amp has been deliberately designed to drive slave amps, would love to study the design, how it is put together etc, will let you know when I am out with the set, have done a few things with it but will have a serious test in july, with a view to a gig over carnival week end, please keep up with my post in the amp forum, I am posting a 600 watt amp build there-will be updated once a week-only work on them at the week ends. |
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JAH Kreator Hi Fi
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valve head777
Old Croc Joined: 27 July 2012 Location: East Sussex Status: Offline Points: 1780 |
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Freedom of choice, choice of freedom.
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