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Just wanted to give this one a bump as I'm still yet to find cause of the problem.
So to reiterate, all is well unloaded, with load attached...Last edited by Swampy; 05-03-2013, 06:21 AM.
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Hafler G300 clipping on negative portion of waveform
Hi folks,
This amp came in with cooked R59 / R53, also CR11was open. R52 was charred a little measured ok...
I've replaced R52...
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Yah, an ancient and rare beast...bit of a challenge to work on, turret strips are under tubes mounted horizontally.
So oscillations cease...
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Oscillations
Hi,
Have a Jennings Univox J7 with unwanted oscillation in audio spectrum traced to plate of V5. DC voltages are off also.
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DC on opamp outpin
Yo team,
I'm working on a "Master" Solista 160 PA combo (pre/power amp and sub / mid / tweeter in the box) and can't iron...
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My apologies, HV CT on secondary.
This is a replacement tranny, the original (secondary HV winding is kaput) had a filament winding, a HV winding...
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Hiwatts"Custom 20" ptp
Hey guys,
Have just installed a new PT in this unusual number (type is "AP") and have a query regarding PT primary CT.
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Idles @ 30mA in both modes.
In stereo mode both left and right dissapate 65 watts into 8 ohms, draw 0.76 amps at full output. Power amp is...
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I lie. Signal all good on 1 and 2, also verified at C601 + 602. Measured 58 watts into 8 ohms from R - to ground with mains current draw > 3 A...the unit...
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Right. So first mistake was hooking up scope over load, figured that one out after taking out mains fuses.
Only measure signal on...
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ROTEL RB-870 low output in bridge mode
Morning, afternoon, or evening to you.
Amp came in to workshop with fuses blown of R channel power supply, replaced bridge rectifier and all...
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No conductivity to pin 5...that'll teach me for measuring on the board side.
Well that's a bloody relief innit....
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My apologies, I popped in a new valve this morning before measuring.
HT is steady, any other intermittent components would affect both sides...
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Schem is correct, aside from small cap between PI plates that I failed to draw.
Today measured 0.9V drop from cathode to grid on both sides,...
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None taken...no room for ego in science!
For sure, at least we can get some 'ballpark' figures though right?
Readings with...
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Here's what we are looking at.
All readings are taken with driver tube in and .5 v pk - pk at input. PI should be an AT7 but...
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