FS: F5 pcb populated with matching transistors.

particleman14 · 31st October 2011, 03:12 AM

I have for sale some F5 pcbs that are fully populated waiting to be cased up. boards come with matched transistors from h_a. The pcbs are the long version from suds.
I also have a psu pcb available that I'll throw in as well.
asking $110 shipped CONUS preferred
http://imgur.com/a/2sCzE

particleman14 · 1st November 2011, 10:21 PM

bump

elecres · 3rd November 2011, 12:44 AM

interested in new york 11764 tnx

gianc · 3rd November 2011, 04:33 PM

I am accumulating parts to build an F5, already have two 23-0-23 @ 6A plitrons from another project, is it possible to use these for the F5. If so what changes would be required.

Also there are some Kendeil ps caps on ebay, wondering if these are better than panasonic T-UP types.

particleman14 · 3rd November 2011, 06:25 PM

I believe 23 is too much as 18-0-18 is the recommended voltage.. as for caps just get some with high hours rating.

gianc · 3rd November 2011, 08:02 PM

I understand 18 is recommended, what effects would using the higher voltage have on the circuit and sound?

particleman14 · 03:26 AM

perhaps an easier solution would be to grab the antek 400va 18V out Antek - AN-4218

you'll be dropping more volts with the 23v transformer, so heat might become an issue. read here F5 power amplifier that was what I could find on higher voltage secondaries.

I can't comment on how sound might be affected..

fepie · 5th November 2011, 03:10 PM

If you ship in Italy i am interested.

gianc · 03:48 PM

Thanks for the link that was very helpfull. I will be getting the 400VA from Antek and save the other transformers for something else.

Question on the heatsinks for F5, I have two large heatsinks which will be more than adequate. I am wondering if I can get away with only using one by cutting it down the center and using each half on the sides of the amp similar to the production F5. Each heat sink is 8 lbs, 12 inches tall, 6 inches wide. The top and bottom plates for the amplifier will be 1/4 aluminum, face plate will be 3/8 aluminum. This should also help in dissipating the heat.

particleman14 · 6th November 2011, 01:28 AM

fepie. shipping to italy will cost me $15 extra usd.

gianc i'm not sure if that heatsink will be enough for both channels.. you'd have to do thermal calcs with that extrusion profile to be sure...

31st October 2011, 03:12 AM	#1
particleman14 diyAudio Member Join Date: May 2010	FS: F5 pcb populated with matching transistors. I have for sale some F5 pcbs that are fully populated waiting to be cased up. boards come with matched transistors from h_a. The pcbs are the long version from suds. I also have a psu pcb available that I'll throw in as well. asking $110 shipped CONUS preferred http://imgur.com/a/2sCzE

3rd November 2011, 12:44 AM	#3
elecres diyAudio Member Join Date: Aug 2008	interested in new york 11764 tnx __________________ As in life,brilliant moments are worth the price of admission !!

3rd November 2011, 04:33 PM	#4
gianc diyAudio Member Join Date: Oct 2004	Is 23v transformer ok for F5 I am accumulating parts to build an F5, already have two 23-0-23 @ 6A plitrons from another project, is it possible to use these for the F5. If so what changes would be required. Also there are some Kendeil ps caps on ebay, wondering if these are better than panasonic T-UP types.

4th November 2011, 03:20 AM	#7
particleman14 diyAudio Member Join Date: May 2010	perhaps an easier solution would be to grab the antek 400va 18V out Antek - AN-4218 you'll be dropping more volts with the 23v transformer, so heat might become an issue. read here F5 power amplifier that was what I could find on higher voltage secondaries. I can't comment on how sound might be affected.. Last edited by particleman14; 4th November 2011 at 03:26 AM.

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1st November 2011, 10:21 PM	#2
particleman14 diyAudio Member Join Date: May 2010	bump

3rd November 2011, 06:25 PM	#5
particleman14 diyAudio Member Join Date: May 2010	I believe 23 is too much as 18-0-18 is the recommended voltage.. as for caps just get some with high hours rating.

3rd November 2011, 08:02 PM	#6
gianc diyAudio Member Join Date: Oct 2004	I understand 18 is recommended, what effects would using the higher voltage have on the circuit and sound?

5th November 2011, 03:10 PM	#8
fepie diyAudio Member Join Date: Nov 2004 Location: Foligno	If you ship in Italy i am interested.

6th November 2011, 01:28 AM	#10
particleman14 diyAudio Member Join Date: May 2010	fepie. shipping to italy will cost me $15 extra usd. gianc i'm not sure if that heatsink will be enough for both channels.. you'd have to do thermal calcs with that extrusion profile to be sure...

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