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TGM8 - an amplifier based on Rod Elliot P3a
TGM8 - an amplifier based on Rod Elliot P3a
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Old 24th January 2018, 11:55 PM   #841
Bigun is offline Bigun  Canada
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TGM8 - an amplifier based on Rod Elliot P3a
Good news ! - are you pleased with the results ?
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Old 7th February 2018, 04:52 PM   #842
RCruz is offline RCruz  Switzerland
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TGM8 - an amplifier based on Rod Elliot P3a
Finally had the opp to listen to it and i am really pleased with the sound.
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Old 9th February 2018, 02:48 AM   #843
Bigun is offline Bigun  Canada
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TGM8 - an amplifier based on Rod Elliot P3a
that's great!, any photos ?
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Old 9th February 2018, 06:34 AM   #844
auriga2001in is offline auriga2001in  India
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Default Thanks Bigun

Thanks for the wonderful amp. I have two amps (BJT, Latfet outputs) running wonderfully for a year now.
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Old 9th February 2018, 11:49 AM   #845
Bigun is offline Bigun  Canada
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TGM8 - an amplifier based on Rod Elliot P3a
Fantastic, it's good to know that it works well with the Latfets.
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Old 9th February 2018, 02:22 PM   #846
pinnocchio is offline pinnocchio  Canada
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I'll eventually rebuild a new channel. I must have a passive component busted since all active have been replaced on the defective channel. I will measure all passive in-circuit and compare values with working module. Too bad this happened to it.

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Old 9th February 2018, 02:32 PM   #847
Bigun is offline Bigun  Canada
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TGM8 - an amplifier based on Rod Elliot P3a
I was even wondering if there is a defect in the bare pcb from the manufacturer. I imagine this is very rare on simple two-sided board though. But if you have a spare pcb and have the patience to start-over or transfer parts across then a clean-build might help ??
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Old 9th February 2018, 02:35 PM   #848
pinnocchio is offline pinnocchio  Canada
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I have a few spare PCBs so I might just do that

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PREAMPs : Bal AMB α10 + JC-80 | Bal DCB1 | Bal LDR3x | AMPs: AMB β24 | USSA3 & 5 | FO v1.4 | TGM8 | VZ Audio NS OPS | NX Amp | FC-100
DACs : TPA Buffalo II + OPC's NTD1 I/V | JLsounds | Mirand AK4490 + Discrete Output Speakers : Troels Gravesen ATS-4 | Sagwee LT V3
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Old 10th February 2018, 05:55 AM   #849
pinnocchio is offline pinnocchio  Canada
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I disassembled the defective board part by part and seems like the culprit is R19, 10R 1W resistor that went kapout... It was reading 325K but seemed intact to the eye... Now the PCB is way past rebuild, I mean I could re-populate it since all SMD are still on it but many pads have gone so it is best to order new parts (I'm keeping what I salvaged since it was all tested ok).

What went so wrong that R19 got defective? It is a 1W resistor, at this power level I think I would have seen some smoke? It is not even a little dark/burned...

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DACs : TPA Buffalo II + OPC's NTD1 I/V | JLsounds | Mirand AK4490 + Discrete Output Speakers : Troels Gravesen ATS-4 | Sagwee LT V3
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Old 10th February 2018, 02:19 PM   #850
Bigun is offline Bigun  Canada
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TGM8 - an amplifier based on Rod Elliot P3a
Well R19 (if I remember) is the Zobel resistor. For this to overheat there likely would have been some h.f. oscillations which passed a lot of h.f. current or else the capacitor in series with R19 is shorted out and passed a lot of dc current. It's hard to say why this happened but likely was a result of your 'torture testing' using your 'suicide speaker' when you had a metal particle short. I have not tested the amp to it's limits, i.e. I didn't try to break it by going into hard clipping into a load or driving square wave at 20kHz into load etc. so I am not sure how the amp will show a failure. Well, partly I'm lazy because I don't want to be rebuilding the amp! Anyhow, it's really nice that you found the failed part. Why it isn't showing burned signs, well that depends on the construction and materials, not all resistors are made the same way. What type / part number did you use for R19 ?
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