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1. Scientific workplace 6 keygen manuals#
2. Scientific workplace 6 keygen manual#
3. Scientific workplace 6 keygen tv#
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So, I guess that means using source resistors at the output. I checked out Mike Elliot's instructions, and I don't think I'll be buying 1000 IRF130's and IRF9130's, burning them in, and matching them. Anyway, it's good to get your help on this. Glad the tubes and other components are likely okay. So, I think I'll replace some of things you mentioned anyways just to be careful, and maybe do some upgrades. But I didn't wait that long to measure it cause if the resistors blow then there goes the relay and maybe power supply. When the relay turns off there should be 44 volts at the gate, and not much current should pass through the protection zeners. So, while it's warming up at least, for a couple minutes, there is 44 volts across the gate resistors. And the the heater supply only puts out 257 volts.Īnd there is a relay which connects the gates to ground on turn on to prevent thumps and stuff. Anyway, I turned it on and measured 157 volts across the coupling cap. But, it never did look modified to me and this circuit board is the same board as the SA12 (an 80 watt amp). But, months later he said they did, but he didn't bill us for it cause of the mix-up.

We never were sure because of a mix-up we had with the dealer, who said they didn't modify it cause they didn't bill us for it. Okay, well this amp is actually an SA12 that was supposedly modified to be a SA100. That seemed like most logical explanation, but then I think I found the problem. Okay, I took your advice and looked into it. I would also replace the bias adjust transistor and check all the power supply voltages before installing the new output transistors. Also check voltages, without the caps in the circuit, on the tube and solid state side separately to try and isolate a problem before reinstalling them. I would pull out those caps and check, or just replace them. This would have blown the snubber zeners also. The only thing I see that can burn the gate resistors is maybe one or both of the coupling caps (C3 & C4 on the schematic) are shorted and put about 225v to the gates. Got to these babies cooking again! If I get the problem fixed I may also do some mods, but one thing at a time. The potentiometers for bias and DC offset are labeled, so that should be easy enough to fix. Or maybe Counterpoint adjusted the bias to run cooler after I stuffed it under a cabinet once and it over heated, and got damaged? I didn't think MOSFETs need bias adjustment, but I guess they might after all this time. Both channels have been running really cool (ice cold) for years. They are the 75 watt IRF130 and I can get replacements at Mouser. It seems to be just a matter of blown output transistors. The left channel seems to work okay now with the new JJ 6922 tubes. It would help, though I think I can do the repair without one. I'd like to find a schematic for this, if it's out there. It looks like the tubes are capacitively coupled to the gates with Wima 1uF caps. Maybe a large transient blew the gates? But the gates are protected with diodes. I don't know what blew the transistors though, unless it happened when a tube died? So, the output transistors are toast as well. I see the gate stopper resistors are blown on the N-Channel devices. But, then things got worse and the left channel quit working altogether.

Scientific workplace 6 keygen tv#

I just let it run like that for a year since this was just used for TV speakers. The left channel would make distortion and later the right channel too, especially at low frequencies. It started having problems shortly after I replaced the tubes in it, with Electro-Harmonix 6922 tubes.

Scientific workplace 6 keygen manuals#

They are knowledgeable of it.Ĭounterpoint Diagrams, Schematics and Service Manuals - download for free! Including: counterpoint sa 3 1 preamplifier service manual, counterpoint sa5 1 new. If you have questions about Tapatalk, contact Hdale85 or Chris D.

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Scientific workplace 6 keygen manual#

Counterpoint Sa 220 Service Manual 4,9/5 1296votes