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In Reply to: RE: Ping Mike Samra. Re strapping my LEAK St20s to mono posted by Timbo in Oz on July 19, 2017 at 21:40:07
Tim'
You lose some overall depth when you strap amps in parallel.I'm not sure you will gain a lot with ST20s but you can strap them. Just make sire the impedances are the same.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Follow Ups:
So bridge them then...:) 8R load across each of the 4R taps. You will need to feed the amps a balanced signal( like what you'd get out of a phase splitter ).
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
Edits: 07/23/17
Even without a 1st order HP filter @ 150Hz, many people find 20 watts of PP valve power sufficient for a QUAD 63.
See below for the mods done in the 1990s to both of these LEAK stereo amps. Both now have 4 x 470Uf filter caps, bypassed. The first two caps are in parallel, IIRC.
Less NFB, yet with lower distortion, quieter, more power, and far better bass.
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
You can do phase splitting with a transformer too. The UTC A-18 is quite fine, and will swing a remarkable voltage across its secondary at 18-20 cps.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
I will still try the single St20. As I pointed at in this thread each Chassis can now deliver 20W RMS pc. And they have 1st order HP PLL input filters on them, so 20WPC just may be enoughIF it's not. Not loud enough cf the Fostex, I will decide if I prefer the Valve sound anyway and then go with balanced drive.
More money! Sighhh!
And IF I prefer the valve sound over the Fostex it's going to get pooged / blue-printed.
? We have very hot Summers, and valve amps are then at risk.
Even more $$$$!
IF it's the Fostex I prefer, then I may well sell the LEAKs.
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JBTWay - Your quote re a 'Quaker' is a favourite of mine. Even though I'm not an American, and not a gun rights type, either.
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
Edits: 07/26/17 07/26/17
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