F5 power amplifier

[4345owner]

Thanks to all for the knowledge! I hit Radio Shack up on the way home from work so I can start experimenting right away. Some better parts from Mouser will arrive Friday.

I always wondered what the significance of fifteen watts in particular was. Silly of me to ignore the experimental possibilities all these years, a mistake I won't make again. Next year I should build another amp - but I don't need anything else.

[Alettagla]

Does anyone know of a distributor in the Netherlands that has mica insulators for TO-247 packages.

Your helpis very much appreciated!

Regards René

[labjr]

Originally Posted by Alettagla

Does anyone know of a distributor in the Netherlands that has mica insulators for TO-247 packages.

Your helpis very much appreciated!

Regards René

Ebay distributes everywhere!

[albertNL]

Originally Posted by Alettagla

Does anyone know of a distributor in the Netherlands that has mica insulators for TO-247 packages.

Your helpis very much appreciated!

Regards René

You can buy Kerafol (much better than mica insulators) from Conrad in Europe. Conrad - Uw online shop voor elektronica, computer, multimedia, modelbouw & techniek

Just type kerafol in the search box. You want the type with the highest "warmtegeleidbaarheid".
I have bought a 190mm x 190mm sheet and just cut the sizes I need with a pair of scissors.
Warmtegeleidende folie Keratherm - Rood 86/82 Kerafol 86/82 (l x b) 190 mm x 190 mm Dikte 0,25 mm 6.5 W/mK in de Conrad online shop

[4345owner]

Originally Posted by 4345owner

I always wondered what the significance of fifteen watts in particular was.

That should have been fifteen ohms, of course. I need to get more sleep.

[labjr]

Anyone sell Kerafol in USA? Does Zhoufang still sell?

[forgehammer67]

Hello, who can inform me to find the F5 power supply pcb ?

Thanks.

[6speed]

Originally Posted by forgehammer67

Hello, who can inform me to find the F5 power supply pcb ?

Thanks.

The diyAudio store carries them, I'm not sure where you are located so shipping may or may not be a concern.

[ANADIGIT]

Hi, guy
Does anyone need F5 mod with Transformer Coupling and control VGS with OPTO COUPLER ?

Maybe my dream is F6 with IRFP Mosfet Output :-)

[MEGA-amp]

25V 4A/ch, dual outputs, thermistor circuit and current protection removed. All other resistor values are stock.

Somebody asked for some more pics of the PS, so here it is. 2 - 4.0mH paralleled per rail, and 1 - 2.7mH per rail. After about two hours, the 2.7mH 12ga coils have that burning enamel smell, which isn't too pleasant. 3 - 60V 47mF per rail, and a small group of C's (forget values) before going to the amp. Adding two more pairs of outputs definitely changed the character of the sound, for some reason I enjoyed the single pair version better, but I'll need to chill the incoming water If I want to increase bias on that one. I'll probably start by increasing the feedback resistors on this version...not much else to change.

-john