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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 20th October 2020, 01:13 AM   #2201
ggetzoff is offline ggetzoff  United States
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Eric, it’s a super small amp that you find a place for....
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Old 20th October 2020, 01:22 AM   #2202
Eric is online now Eric  United States
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A guide to building the Pass F4 amplifier.
Sure, go ahead and encourage me Maybe I could use it in the office in place of my ACA...
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Old 20th October 2020, 02:17 AM   #2203
Zen Mod is offline Zen Mod  Serbia
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A guide to building the Pass F4 amplifier.
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Originally Posted by ggetzoff View Post
Okay, some more amp porn. Just finished another tube amp to drive the F4. This time an even simpler design: a 6CY7, which is a dual triode (driver and output) in a single envelope. I chose again to use the fabulous Type 80 rectifier and 4 ohm secondaries on the OTs.
If you guys havenít heard the F4 driven by a flea amp, you should . The distortion products of a tube amp I think go beyond descending levels of H2, H3....so on and so forth. Meaning you canít just add H2 and H3 (as I have tried) to get exactly the same experience of having and an actual tube. Credit goes to Matt for his great and very affordable design.

https://www.cascadetubes.com/wp/wp-c...-schematic.jpg

Attachment 885857
Fugly!

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Old 20th October 2020, 05:17 PM   #2204
PKI is offline PKI  United States
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A guide to building the Pass F4 amplifier.
Quote:
Originally Posted by ggetzoff View Post
Okay, some more amp porn. Just finished another tube amp to drive the F4. This time an even simpler design: a 6CY7, which is a dual triode (driver and output) in a single envelope. I chose again to use the fabulous Type 80 rectifier and 4 ohm secondaries on the OTs.
If you guys havenít heard the F4 driven by a flea amp, you should . The distortion products of a tube amp I think go beyond descending levels of H2, H3....so on and so forth. Meaning you canít just add H2 and H3 (as I have tried) to get exactly the same experience of having and an actual tube. Credit goes to Matt for his great and very affordable design.

https://www.cascadetubes.com/wp/wp-c...-schematic.jpg

Attachment 885857
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Fugly!

Such a minimalistic design! That is like Papa's amp, but tubes :-) Am I correct that you will need another preamp in front of it?
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Old 20th October 2020, 05:24 PM   #2205
ggetzoff is offline ggetzoff  United States
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No preamp necessary, in my case. I drive it with a couple of tube dacs, 3.2-3.5 vout.

This setup would provide the vast majority of builders here with enough output. If not, then I would just biamp the loudspeaker, and forget dual F4s. Just power your woofers with some serious current, and let the tube / F4 drive the upper octaves.
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