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NAD 7250PE Integrated Amplifier - Troubleshooting the power amp
Hi Folks,
I need some help thinking through next steps for the repair of the power amp section of a NAD 7250PE stereo. It's a bit more of an...Last edited by Wombaticus; 07-31-2022, 08:32 PM.
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Leo,
Spoke with Richard -- good advice, and thanks for the number! Unfortunately they want $130 + shipping for the (fairly dinky) mesa OT....
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Mesa Boogie Nomad 55 OT
Hi All,
I’ve got a Mesa Nomad 55 on the bench with a dead OT. I’ll be dammed if I’ll pay MM $170 for their drop in replacement. Presumably...
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Here's a relevant discussion about gas discharge tubes and MOVs over at AX84: AX84.com - The Cooperative Tube Guitar Amp Project
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No, you have this backwards. ESR *decreases* approximately linearly with increasing capacitance, at least when considering caps within the same product line...
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Under normal operating conditions, there shouldn't be more than maybe 500 microamps through the whole pot, and maybe 200uA through the wiper, tops. But while...
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No. The Zener here is *not* meant to protect the gate (14NK60 series has built-in gate protection). In this circuit, D5 and R7 are meant to be a crude current...Last edited by Wombaticus; 02-23-2016, 01:38 PM.
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I'd add a, say, 220K resistor from the wiper of the bias pot to the top of the 25uF cap. That'll keep your power tube bias safe if the wiper of the bias...
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I'm virtually certain its 495V on the plates and 490V on the screens, which makes sense given the 100 ohm screen grid resistors. I reckon that operating...
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You're not going to find this on a commercial amp, because -- as others suggested -- a commercial manufacturer would simply re-spec the transformer. We smaller...
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A few thoughts here. First, the original poster indicated that they intended to use an ultralinear output transformer. As it happens, 560V on plate / 553V...Last edited by Wombaticus; 11-12-2015, 08:38 PM.
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I've done this with the good old LM386 chip amp running off a 12V supply that was also used for relay switching and DC heaters. Worked just fine, although...
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I'm not at all convinced that a cathode or source follower is the best way to drive a reverb tank! As reverb tanks are inductive current-driven devices it...
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This doesn't sound right to me. Per my post above, regardless of duty cycle, the rms current in *each* of the centre-tapped secondary legs is NOT 50% of what...
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As would most people, and that's the problem in a nutshell. An ideal centre tapped PT with full wave recto producing equivalent rectified voltage and delivering...
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