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Part for Punch 75 HD
Part for Punch 75 HD
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Old 6th January 2013, 09:00 PM   #1
dwvinky is offline dwvinky  United States
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Default Part for Punch 75 HD

Just recently picked up a 75 HD Mosfet from the early 90s. One channel is significantly louder than the other. There is a hybrid module labeled HB-PIM that appears to have been hot at some point. It appears to be a preamp board. Has 3 op amps, couple of caps, and a handful of resistors. Some of the traces were burnt open. Repaired them and now amp is whining on channel that was previously low. Amplitude is now equal. There was a missing cap that the previous owner had just jumpered across. I'm assuming the whine is caused by too much gain probably caused by the shorted out cap. Anyway, anyone know where i could source a replacement module?
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Old 6th January 2013, 09:15 PM   #2
seankane is offline seankane  United States
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Location: Washington State
The little aluminum caps leaked on those boards, eating up the traces. The boards are extremely difficult to repair. Once the fluid gets on the boards, in most cases they are junk. I have replacements. PM me and we can discuss price, payment, and shipping.
Pyramid 52 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch
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Old 6th January 2013, 09:58 PM   #3
dwvinky is offline dwvinky  United States
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P.M. sent.
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Old 31st August 2017, 01:25 AM   #4
Relax3030 is offline Relax3030
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Sean Kane by chance do you still have any more replacement boards
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