F5 power amplifier

[PiotrK]

Originally Posted by danny_66

Here's another source for transformers:
http://www.toroidy.pl/index.php?opti...id=6&Itemid=13
They have a range specially made for audio, good prices too.

Yes, those are very popular, probably best, in Poland.
Quality is excellent.
All my trafos came from "Toroidy".

[jackinnj]

Yupp, they are the diyenclosures models -- i think i purchased them before he had a website -- the handles I use were purchased at Home Depot, and the rubber footies are from McMaster.

[Beftus]

Originally Posted by Jaac

I've recently bought two 300VA 2x 18V toroids directly from the amplimo site. Emailed the guy if he could pot them into metal cans. And they do, that it looks very nice i will post some pictures later on.

What's the upcharge for a potted toroid?

[jackinnj]

Originally Posted by Beftus

What's the upcharge for a potted toroid?

You can pot them yourself.

[jacco vermeulen]

Originally Posted by danny_66

Another source for transformers, good prices too.

$150 for a 2KVA specimen is more than good in these parts.
The quotes which i received for multiple 2x50V-2KVA local production items ranged $600-$900 each.

[Zen Mod]

Originally Posted by jacco vermeulen

$150 for a 2KVA specimen is more than good in these parts.
The quotes which i received for multiple 2x50V-2KVA local production items ranged $600-$900 each.

greedy Dutchies

[Lucas_G]

Originally Posted by Beftus

Check amplimo.nl. They offer 300VA, 500VA, 625VA, 800VA toroids with twin 18V secondaries. 500VA should be enough for a F5. Can be bought online @ deaudiofabriek.nl. Success!

Thanks for the suggestion. They do have a large collection, but I checked their prices and they are ridiculous. They have recently increased the prices with some 20% and they are now twice the price of their competitors in Gemany (who also offer good quality). Amplimo seems to be selling well because they have got a good reputation and they want to cash it!

I will look further...

[Lucas_G]

Originally Posted by nigelwright7557

Try www.farnell.co.uk

Thanks for the tip. Unfortunately Farnell too stops at 180 VA with their 18 V types...

[Lucas_G]

Originally Posted by Zen Mod

with shottky diodes you'll have somewhat higher voltage , but not much .

just compare voltage sag across plain vs. shottky diodes , and you'll know .

Papa uses plain bridges in his F amps ,at least to my knowledge

Apart from the fact that Schottky diodes have less voltagedrop, did someone compare the influence on the sound of the F5.

Nelson has a very sound no nonsense approach to this and ordinary bridges are wonderfully reliable and cheap, yet the difference in spectral polution of the rails cannot be denied. The question is how much of it is left after the filtering in the PSU. Anyway it would be nice to hear from someone who did a comparison...?

[Lucas_G]

Originally Posted by Zen Mod

greedy Dutchies

How do you know?

Are you married to a Dutch girl?

Then, I could comfort you with the thought that all girls become greedy and pennywise when they see how much we spend on our hobby, whatever nationality she has!