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Parallel LM4780 Protel Amp IC layout help
Parallel LM4780 Protel Amp IC layout help
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Old 6th June 2019, 07:52 PM   #1
AndroidClone is offline AndroidClone
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Join Date: Oct 2012
Question Parallel LM4780 Protel Amp IC layout help

I just acquired a pcb for a parallel lm4780 x2 12ax7 tube buffered amp.

I need a little help getting the best bang for my buck. Can any pcb layout gurus chime in on which components to choose that will dramatically change the sound signature on the IC level? Much appreciated, thanks for looking. Schematic and Parts list are as follows:



Capacitors
0.1uF 50V 10 Mylar, MKP or MKT
10u 50V 2 E-Cap Elna or compatible
100u 50V 14 E-Cap, Elna or compatible
220u 50V 2 E-Cap, Elna or compatible
2.2u 50V 2 MKP, MKT
0.22u 50V 4 MKP, MKT
47pF 50V 4 MKP, MKT
220pF 50V 4 MKP, MKT
1000uF 50V 10 E-Cap, Elna or compatible
10000uF 50V 4 E-Cap, Elna or compatible

Resistors
22K 1/4W 1% 10 metal film, metal oxide
1K 1/4W 1% 11 metal film, metal oxide
10K 1/4W 1% 2 metal film, metal oxide
47K 1/4W 1% 3 metal film, metal oxide
1.5K 1/4W 1% 3 metal film, metal oxide
4.7K 1/4W 1% 2 metal film, metal oxide
6.8K 1/4W 1% 2 metal film, metal oxide
1M 1/4W 1% 6 metal film, metal oxide
100K 1/4W 1% 1 metal film, metal oxide
220K 1/4W 1% 1 metal film, metal oxide
470K 1/4W 1% 2 metal film, metal oxide
2.7R 1W 1% or 5% 4 metal film, metal oxide, carbon film
0.18R 2W 15 or 5% 4 metal film, metal oxide, carbon film
8.2K 1W 1% or 5% 2 metal film, metal oxide, carbon film
56K 1W 1% or 5% 2 metal film, metal oxide, carbon film
10K 1W 1% or 5% 2 metal film, metal oxide, carbon film
2R 2W 1% or 5% 1 metal film, metal oxide, carbon film
68R 1W 1% or 5% 1 metal film, metal oxide, carbon film
33R 1W 1% or 5% 2 metal film, metal oxide, carbon film
330R 1W 1% or 5% 2 metal film, metal oxide, carbon film

Semiconductors
LM4780TA 2 LM4780TA
6N11 2
1N5408 1
GBJ2502 1 GBJ2502 or higher voltage rating compatible
2SC1815 2
TL431 1
1N4007 6
MPSA42 2
MPSA92 2
1N4148 1
3mm LED 2
Misc
0.7uH Inductor 2 "optional component, can be replaced by a zero-ohm
jumper.PCB silkscreen 0.7mH is a typo."
9 pin tube socket 2
2-pin terminal block 5
3-pin terminal block 1
12V relay 2 Omron G2R-1-DC12 or compatible


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