F5 components, parts you use

[tinitus]

hey

I hope this thread title is precise enough to give a clear direction, and to keep it on track

please post pictures
tell about your experiences
ask questions

anything about F5 components

[Tea-Bag]

This is my reference F5 amp , for now.

This is a no thermal compensation, no current limited design, with Toshiba outputs. The resistor compliment is now (from PRP in pic) 1k texas instruments z-foils, 47r z-foils 100K caddock TSF, 1K prp resistor in parallel with 5K pot for setting bias.
The source jfet resistors are 10R caddocks, 50R caddocks for feedback resistors and Mp-930 .5R source resistors for toshibas.

The board is a cviller version 2 board, hacksawed down to fit into smaller chassis. Run ~.750mv bias.

[flg]

My F5 amp is yet to be completed. And, I don't have any of it here with me to shoot some pics.
However, I'm using a 1 watt PRP JFET Source R and 1/2 watts in the JFET input, Drain, and MOSFET gate stoppers. No temp correction or current limiting as yet. I'm using 5 watt mills MRA-5s at the MOSFET Source Rs and Feedback Rs.
I'm also using a dual pair of Toshiba outputs on The CViller Board.
So far the PSU consists of 1 400VA 2x15 Antek per channel with shotkey diodes (don't remember which ones at the moment) and CRC filter. 5x CDE 10,000uF > 2X .25ohm 50W mills in paralell > 5x CDE 10,000.
I guess that about covers most of the components?

[AuroraB]

Originally Posted by tinitus

hey

anything about F5 components

I did ask this question in the other thread, but there was no response..
This thread can be a very valuable resource to already established builders of the F5 - but with the potential danger of being stamped as a sour *** - which I'm certainly not - what about potential new builders....?
All the information is readily available , and a good selection of components out there,too - with one crucial exception - the 2SJ108.....????

[Russellc]

There are pics of my F-5 in the pictures thread/sticky. I used the Tech-diy parts kit, very basic, resistors were Panasonic for the larger values, and Dales
for the smaller ones. IRF out puts, Antek transformers.

I'm planning a couple more builds and want to use the Toshiba outputs this time, which I have aquired several sets of, along with matched Jfets. I would like to make this one a little more of a hot rod, so exotic resistors and so forth are what I have my eye on, this one will have no current limiting either. This thread is very timely, efforts appreciated.

Russellc

[flg]

Originally Posted by AuroraB

...- with one crucial exception - the 2SJ108.....????

I neglected to mention, I will use the 74s and 170s as I have several. Rather than the 370s and 108s

[Bksabath]

Hi Tea bag
I have eard very good results /comment for the Z foils.

What are your impression?
Where did you get them?

Tanks
Al

PS. any spares?

[Tea-Bag]

Originally Posted by AuroraB

All the information is readily available , and a good selection of components out there,too - with one crucial exception - the 2SJ108.....????

Originally Posted by flg

I neglected to mention, I will use the 74s and 170s as I have several. Rather than the 370s and 108s

Yes, go with 2SK170's and 2SJ74's. There are still plenty to be had.
I use member BLUES in the states, but Spencer is also a reliable source for these parts. This should be a non-issue.

Tech-diy also offers the kits with the JFET included, and other parts. His service is also excellent. Ships international. I just bought 4 matched sextuplets of IRF's from him.

[Tea-Bag]

Originally Posted by Bksabath

Hi Tea bag
I have eard very good results /comment for the Z foils.

What are your impression?
Where did you get them?

Tanks
Al

PS. any spares?

These values 1K and 47R were about 10 bucks each for me.
I put them in my DCB1 first and was very impressed.

I put them into the F5 following the PRP, and I got a more detail, and a good tone from it. I've noted that the DCB1 is more prone to noticing resistor changes than the F5, but I can hear a difference between them to. It's quite possible less expensive resistors could bring equally good results, one has to play around with them. Any first build I do, I start with Dale's or PRP's. Both are very good. Some people think resistor mod's are bogus, but I disagree. They certainly change things

[Russellc]

Originally Posted by flg

I neglected to mention, I will use the 74s and 170s as I have several. Rather than the 370s and 108s

Same here...

Russellc