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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 28th December 2013, 09:28 PM   #121
Triodethom is offline Triodethom  United States
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Originally Posted by 6L6 View Post
Use a AN-4220 and make sure you use 35V PSU caps. (which 99% of people do anyway...)
How about the AN-4222 that would give 35 watts vs 25 for the f4 and looks like the 170s would hold up to 28to 31 rail volts ? same price $ 51. Though the big case would be advised for the increased heat would it not ?
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Old 28th December 2013, 09:32 PM   #122
6L6 is offline 6L6  United States
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A guide to building the Pass F4 amplifier.
You could use the 4222, and as for heat, you can always decrease the bias a little... I'm going to build a BA-3 Complimentary in a 4U, (with 24V transformer) and that's the exact same output stage as the F4.

However, the big (5U) case is awfully nice to have when swapping between different amps. The extra room makes a PCB change into a 1/2 job.

I would be very interested in a slightly higher voltage F4.
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Old 2nd February 2014, 09:20 PM   #123
delecoy is offline delecoy  United States
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I'm going to begin assembling my F4 today. Not certain at this point about one thing though - whether or not I should do the crippled version. Planning on building a BA-3FE preamp, but have to get a few more things here before work can start on it. In the meanwhile, it's really cold outside ( for Texas ) and all the parts for the F4 are here. The only preamp I have in the house is a GFP-555 which the manual says will do 10V out max, but I'm unsure how much gain it has, or how to figure that out ( no luck googling so far ). The F4 will, without question, be paired with the BA-3FE after that ( maybe a Luminaria pre in the future...who knows ).

So should I drop the input jfets as directed in the big F4 thread?
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Old 2nd February 2014, 09:24 PM   #124
6L6 is offline 6L6  United States
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A guide to building the Pass F4 amplifier.
No. Make it stock.
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Old 2nd February 2014, 09:25 PM   #125
delecoy is offline delecoy  United States
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I also have quite a few nice 5814's, 12AU7's, and a couple E80CC's - so theres a slight chance ( albeit remote ) that the F4 may get hitched to a MiniMax preamplifier one day as I could keep one of those in nice tubes for decades.
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Old 2nd February 2014, 09:25 PM   #126
delecoy is offline delecoy  United States
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Will do. Thank you .
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Old 2nd February 2014, 10:36 PM   #127
delecoy is offline delecoy  United States
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Default About to begin.....

Learned several important lessons in the course of assembling a DCB1. Don't get the iron too hot, dont touch said iron to ones skin, and start drinking beer at the beginning of the build ( not before ) so as to avoid excessively dulled cognitive function or reflexes ( for when the iron inevitably contacts the skin ).
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Old 3rd February 2014, 04:40 AM   #128
delecoy is offline delecoy  United States
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Default Tonights progress

Didn't make it as far as I would have liked to. Also thinking I should save the PD universal boards for the BA-3 FE and point to point the power supply for the F4. Have plenty of spare I could use.
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Old 3rd February 2014, 01:00 PM   #129
Triodethom is offline Triodethom  United States
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Didn't make it as far as I would have liked to. Also thinking I should save the PD universal boards for the BA-3 FE and point to point the power supply for the F4. Have plenty of spare I could use.
Nice keep up the good work !
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Old 3rd February 2014, 01:23 PM   #130
6L6 is offline 6L6  United States
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A guide to building the Pass F4 amplifier.
Looking good! Keep the photos coming!
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