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A guide to building the Pass F4 amplifier.
A guide to building the Pass F4 amplifier.
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Old 22nd November 2018, 03:30 AM   #1111
JR_W is offline JR_W  United States
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Originally Posted by 6L6 View Post
I really like the F4, as it's totally and completely neutral. The hitch is you basically need a dedicated preamp to run it.
I wonder if a Pass XP-20 can drive it?
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Old 22nd November 2018, 03:45 AM   #1112
Dennis Hui is offline Dennis Hui  Canada
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A guide to building the Pass F4 amplifier.
It can swing the voltage but the standard gain of 10 dB is a bit low for the F4.

For example, if your CD has a max output of 2V RMS then 10dB will only get
you a max of around 5W into 8 ohms.
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Old 26th November 2018, 01:59 AM   #1113
gdglenn201 is offline gdglenn201  United States
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In looking at the build photos of peoples' amps, some builders are using the rectifier section of the power supply and it looks like others aren't. Am I just not seeing it or is "optional". If optional, what would be the argument for and against?

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Old 26th November 2018, 02:28 AM   #1114
vdi_nenna is offline vdi_nenna  United States
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A guide to building the Pass F4 amplifier. Send a message via Yahoo to vdi_nenna
Which post numbers are you seeing this difference?

AC must become DC from rectifier section.

Maybe what you are seeing is a monolithic bridge rectifier is some amp pics and discrete components in others. The discrete rectifiers are sometimes soldered directly on to the rectifier/capacitor boards.
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Old 26th November 2018, 02:35 AM   #1115
vdi_nenna is offline vdi_nenna  United States
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A guide to building the Pass F4 amplifier. Send a message via Yahoo to vdi_nenna
Post 497 shows a monolithic bridge
Post 351 shows discrete diodes connected to the chassis to dissipate heat.
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Old 26th November 2018, 01:57 PM   #1116
gdglenn201 is offline gdglenn201  United States
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Thanks for the links. I see now what I was missing.

Any reason to use the bridge diode section of the PSU board vs. a monolithic rectifier?
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Old 26th November 2018, 02:54 PM   #1117
vdi_nenna is offline vdi_nenna  United States
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Quote:
Any reason to use the bridge diode section of the PSU board vs. a monolithic rectifier?
Short answer is no. Long answer is with discrete diodes you can pick exactly what you want, for example, ultra-fast, soft recovery diodes or some other variation. On the other hand, you can find specialized monolithic bridge rectifiers. I find "special" monolithic diodes to be more expensive.

With monolithic bridges mounting them is simpler. Just 1 or 2 screws to mount it.

Diodes & Rectifiers

HexFred Rectifiers

ultra-fast soft recovery diode Semiconductors | Mouser
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Last edited by vdi_nenna; 26th November 2018 at 03:08 PM. Reason: more info
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