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PeeCeeBee V4H GB

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#241
Hi Shaan, from testing my KSE transistors, the entire N-P-N lot of 20 transistor is HFE value ~88 & the P-N-P lot of 20 transistors is HFE value 179...not sure if they are fit for Q9,Q10 as they are expected to be matched...can try BD series here?
 
#243
Sorry may have missed somewhere, but from the schematic the R27-28 & R29-R30 pairs don't seem to be in sync...the rest of the schematic is perfectly symmetrical...hope this is by design...

R27 - 330R
R28 - 220R

R29 - 330R
R30 - 220R

please confirm
 
#245
kpsthakur said:
Hi Shaan, from testing my KSE transistors, the entire N-P-N lot of 20 transistor is HFE value ~88 & the P-N-P lot of 20 transistors is HFE value 179...not sure if they are fit for Q9,Q10 as they are expected to be matched...can try BD series here?
Click to expand...

kpsthakur said:
found perfect matches in BD series - BD139/BD140 - 2 pairs (HFE 132, 134)
Click to expand...

:up:🙂

kpsthakur said:
Sorry may have missed somewhere, but from the schematic the R27-28 & R29-R30 pairs don't seem to be in sync...the rest of the schematic is perfectly symmetrical...hope this is by design...

R27 - 330R
R28 - 220R

R29 - 330R
R30 - 220R

please confirm
Click to expand...

It's by design so no worries.
 
#248
Sorry to hear about trouble with shipping, but no worries, I have plenty of time.

I found a transformer for cheap with 4x42v, but im uncertain of the grounding layout. I've attached a sketch, but uncertain if the RCA will cause a ground loop. Any suggestions?

I was too late for the PSU, so im using diyaudios protection boards. Had some fun learning autocad and drew my build. Dissipante 3U 300mm. Looking forward to actually build it 😀
 

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#251
Medisinmannen said:
Sorry to hear about trouble with shipping, but no worries, I have plenty of time.
Click to expand...

Packets moving now.

I found a transformer for cheap with 4x42v, but im uncertain of the grounding layout. I've attached a sketch, but uncertain if the RCA will cause a ground loop. Any suggestions?

I was too late for the PSU, so im using diyaudios protection boards. Had some fun learning autocad and drew my build. Dissipante 3U 300mm. Looking forward to actually build it 😀
Click to expand...

I always suggest a star ground created as far as possible from the transformer. Every ground connection except speaker return connected to star, speaker return connected to capacitor bank 0V.

It is hard to tell as it depends on many factor. Best to try your config and see.
 
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