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Old 24th March 2013, 09:39 PM   #9541
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I did that trick in a power amp, even between two 4 pole Mundorfs. The gain in bass punch and precision was enormous. I wish i had a fixed rule.
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Old 24th March 2013, 09:53 PM   #9542
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Yes... the problem is to find the rule....

I did not know one could use 4 poles in power amps......
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Old 24th March 2013, 10:22 PM   #9543
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Sure.
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Old 25th March 2013, 11:30 AM   #9544
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Quote:
Originally Posted by RCruz View Post
Yes... the problem is to find the rule....

I did not know one could use 4 poles in power amps......
I used them powering Erno Borbely I/V DAC, not power amps.
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Old 25th March 2013, 11:41 AM   #9545
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As in the 4 pole caps, the current flows inside the cap through the foil, I was not sure one could use those in high current power amps.
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Old 27th March 2013, 07:00 PM   #9546
RCruz is offline RCruz  Switzerland
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Hi Salas

Today I listened to the 4 x k170 build in a friend's system and found it to have more output on one side.... I did not notice it at home because mypreamp has two pots.

I need to verify the gain of both channels... I will input a 1Hz signal from a pc and measure the input/output voltage difference.... How much voltage can I input ? 1mV ?
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Old 27th March 2013, 07:23 PM   #9547
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You got to verify his cartridge channel balance as much. Azimuth and anti-skating can be very influential. Make 1:200 1K:5R L pad and verify 200mV RMS sinewave on its input at 1kHz. That will ensure 1mV low impedance & low noise feed to your channels. Then you can measure their outputs and see for possible differences.
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Old 27th March 2013, 08:03 PM   #9548
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Thank you
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Old 27th March 2013, 09:15 PM   #9549
RCruz is offline RCruz  Switzerland
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I am very pleased....

Right Vin 1mV Vout 1.78V 65B
Left Vin 1mV Vout 1.8V 65.1dB

The problem lies elsewhere... next time I will invert channels and see...

I still have an issue, as I am using V12r shunts that take a while to reach 35v, I must leave the rig on for a while otherwise I do not get the folded cascode to work....

Sound only starts to happen after the shunts deliver more than 34v....

Appart from that, it plays tunes wonderfully... Just need to get a little more trebble reducing the trebble cap... just a bit (50p maybe)
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Old 27th March 2013, 09:16 PM   #9550
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Use BF245A in Vref or 2SK117GR, catches up faster.
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