Ken Nelson's Phase Linear 3300 ser II Pre-amp

laatsch55

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C103, C104 are polystyrene... they stay. C101 was a tantalum, it's gone, C102 is a ceramic. R101-104 are MF or MO.
 
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laatsch55

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C108,C208,C115, C215, C119 C219, C116, C216, C5, C209, C210, C109, C110,C114, C214, ????????All ceramics Joe.
 
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laatsch55 said:
Thank you Joe, I will do just that....
Click to expand...
Hi Lee
The PSRR, CMRR and Crosstalk of the 4562 is typically 120dB (Wow!!!) which is significantly better than the 2134. The 2134 is a great device, this one is even better. It is not FET input though so its bias current is higher than the 2134. However it is still much lower than the 5532 it is replacing.
 
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laatsch55 said:
C108,C208,C115, C215, C119 C219, C116, C216, C5, C209, C210, C109, C110,C114, C214, ????????All ceramics Joe.
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Definite Yes for improvement
C108, 208, 109, 209, 110, 210, 114, 214

If you are using the headphone amp then these too
C115, 215, 119, 219, 116, 216

C5 is a marginal improvement.

You would get a noticeable improvement by putting a .047u PP bypass from pin 4 to pin 8 of Z101, 102, 103 and 104 on the solder side of the board if space permits below the board.
 
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laatsch55 said:
C103, C104 are polystyrene... they stay. C101 was a tantalum, it's gone, C102 is a ceramic. R101-104 are MF or MO.
Click to expand...
C101, 201 must be low leakage types Lee. That is why they used a tantalum. You would be much better served however to put a low voltage Polypropylene or Polyester in that location if you can fit it.

That is a critical cap and should not be replaced with an aluminum.
 
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Gepetto said:
C101, 201 must be low leakage types Lee. That is why they used a tantalum. You would be much better served however to put a low voltage Polypropylene or Polyester in that location if you can fit it.

That is a critical cap and should not be replaced with an aluminum.
Click to expand...
I would recommend something like 3 of these in parallel Lee, if they will fit. 22uF is too small a value, it starts to cramp the low end response of the phono amp.

505-MKS210/50/20
 
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Didn't realise you could get a 10uf in a poly....,Thanks for your time researching that Joe, very much appreciated...
 
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Same reason you love the 470uF in the C6 location Lee. This cap is robbing the low frequency potential of this preamp.
 
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laatsch55 said:
Not much room to parallel 3, but I'll figure something out.....
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Really funny Lee after seeing that photo. All that bare board space and PL did not leave room for good components.

Those resistors are carbon film except for the 475K one. MF will be much lower noise and have better channel to channel balance. That 5532 should be history, not a bad device but better are available.
 
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Yes Joe, have taken your subs to heart and hace a mouser order going out tonight. So even the ones that look like MF are CF, or CC??
 
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laatsch55 said:
Yes Joe, have taken your subs to heart and hace a mouser order going out tonight. So even the ones that look like MF are CF, or CC??
Click to expand...
Yes Lee, the resistors with only 4 bands are CF, 5% resistors.
Two significante digits of value plus the multiplier band. The fourth band is the tolerance, gold for 5%.

The one set of 475K resistors has 5 bands, three significant digits of value plus the multiplier band. The 5th band is the tempco of the precision resistor. Those are MF resistors.
 
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Pretty tricky code there Joe, got that part of the BOM on my wall here too....
 
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Over 80% of the 1/4 watt resistor values are already in stock here, between the WOA boards, Don's boards, Relay Boards and timer boards almost had all of em covered.
 
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So Joe has lain down the gauntlet, suggesting (with a corresponding part number) to parallel 3 of the red caps and put them where the blue one is. The challenge has been accepted.....
 

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