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Old 2nd February 2013, 09:50 PM   #11
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Quote:
Originally Posted by Marra View Post
Courtesy of Farnell. They seem to hold pretty good.I had to use a stanley knife to remove some.

CBSB-8-01A2-RT - RICHCO - PCB SUPPORT TAPED BASE 12.7MM | Farnell United Kingdom
I couldn't find them at mouser or digikey. Anyone have a US source?
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Old 2nd February 2013, 11:46 PM   #12
coils is offline coils  United States
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Originally Posted by oneplustwo View Post
With two power supplies, did you consider using two sets of rectifiers since you have enough secondaries to supply them?
The channels are sharing the psu. At a glance it looks like two, it was a crc with 30uF/.1r/3uF per rail, with 27.5V rails and 180mV ripple in circuit on the F5c. Now it is 30uF/5mH/90uF clc. The rails from the first board are the inputs to the second. I don't have the chokes yet, so I don't know what the volt or ripple are.

The xfmr is AN-8420, 800va.
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Old 2nd February 2013, 11:49 PM   #13
coils is offline coils  United States
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Quote:
Originally Posted by coils;
30uF/.1r/3uF.
That's supposed to read 30/.1/30
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Old 3rd February 2013, 09:52 PM   #14
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Originally Posted by Russellc View Post
That's HeatsinkUSA 10.08" sink right? Were 4 pieces of this sink required for a one pair output F-5, or were you allowing for future two pairs per channel? Or just good old overkill?

Or do I just not see the double outputs?

Russellc
it's a little overkill. but also 2 pairs of output. +/-23V rails and 1.7A bias, so that it runs a little higher in class A at 6ohm.
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Old 22nd March 2014, 08:41 AM   #15
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I'm building mine today, Standard F5, but I'd like to cascode...

Not sure:

1. Cascode improve sound? if only using one pair of output devices
2. Anything to adjust (resistor values?)

Also is it ok to glue the thermistor on the output device with thermal epoxy. My thermistors are not rigid leaded.

Thanks !!!!
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Old 22nd March 2014, 09:18 AM   #16
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no point in cascoding a standar F5.
and yes. a tiny drop of glue on the thermistors can be a good idea.
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Old 22nd March 2014, 02:31 PM   #17
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Hi,

I have a build documentation using the cascode with double output devices here:

F5c V2.0 Cascode Build Documentation

For those interested, I also have several sets of improved boards that contain P3 as well as the 450 ohm gate stopper to the base of the cascode transistors. Christian was kind enough to provide the improved design for me.
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Old 22nd March 2014, 02:37 PM   #18
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Hi,

Thanks for the docs, I had seen them. I'm not sure about P3, I don't know if worth the trouble, it may since I only have IRFP's as the Toshiba's are way too much at 40 Euro a pair...
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