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thor61 1st February 2013 01:00 PM

Cviller's F5c
Has anyone built a amp based on using these boards ? And if so could one post some construction details ? Thank-you !

AudioSan 2nd February 2013 05:19 AM

1 Attachment(s)
yes. this one.

Marra 2nd February 2013 10:31 AM

I built a standard F5 using these pcb's.It was configured with a single power supply using a cvillers p/s board with 8x33,000uf 40V caps; schottky diodes powered from a 500VA transformer with dual 18V secondaries.The heatsinks are the PS385 from these guys;over sized for an F5 but will come in for something else in the future;
I had difficulty getting the bias adjusted to start with but Zen Mod pointed me in the right direction and it has been making beautiful music for the past 2 years.Never did get round to trying the dual output;cascoded version and I now have a Turbo V2 under construction.
I will post a few pics later.

Marra 2nd February 2013 10:46 AM

Some pictures.I apologise for the not too good quality.

coils 2nd February 2013 03:54 PM


Originally Posted by thor61 (
if so could one post some construction details ?

I used those boards, will take some pics today and post them. I first used the standard first watt zen style crc psu, and ended up with 180mV of ripple, so I am reworking the psu now with more c and im trying choke input.

I did not cascode, used a xfmr with 20v secs, ended up with 27.5 volt rails with the crc. the construction is pretty standard for F5, just more parts to match. also if you want a high bias, get big sinks like the ones in Audiosans pic. those look like usa's 10.08 profile, looks like he has two per channel.

Even with f5t boards on the horizon, I think those boards are well worth the time to build into an amp.


Russellc 2nd February 2013 05:08 PM


Originally Posted by AudioSan (
yes. this one.

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?:D

Or do I just not see the double outputs?


oneplustwo 2nd February 2013 05:17 PM

Where do you get those stick-on PCB standoffs? That would reduce a lot of drilling and tapping. Do they hold well for the long term in the heat of an amp?

Marra 2nd February 2013 06:16 PM

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

coils 2nd February 2013 09:03 PM

2 Attachment(s)

Originally Posted by coils (
will take some pics today and post them

here are a couple of pics, first one channel, then the new power supply in progress

oneplustwo 2nd February 2013 09:42 PM


Originally Posted by coils (
here are a couple of pics, first one channel, then the new power supply in progress

Nice clean wiring! I wish I could wire like that.

With two power supplies, did you consider using two sets of rectifiers since you have enough secondaries to supply them?

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