Edcor P-P Transformers

wrenchone · 27th June 2006, 11:06 PM

I'm thinking of using the 6GF7A in 2 flavors of amp - a low wattage single ended and a ~10W push-pull. I'm looking for cheap iron for both projects. I've seen consinderable discussion of the inexpensive Edcor single ended transformers (I'll probably use them for the SE amp), but not of their push-pull line. How do these sound compared to the usual contenders?

anatech · 28th June 2006, 12:02 AM

Hi wrenchone,
I am pretty sure Tubelab.com has played with them. I'm just waiting until he drops in.

-Chris

rdf · 28th June 2006, 12:26 AM

Have you seen this site?

http://www.angelfire.com/electronic/...0_W_4_6L6.html

tubelab.com · 28th June 2006, 01:30 AM

Quote:

I am pretty sure Tubelab.com has played with them.

No, it wasn't me. The only Edcors that I have tried are the cheap SE's. I have a pretty good selection of P-P transformers to play with, so I haven't bought any in several years.

wrenchone · 28th June 2006, 01:40 AM

I've seen the site with the comparisons for the 50W 6L6 circuit - interesting. However, I'm more interested in how the $17 Edcor
P-P transformers sound. I guess I'll be finding out for myself...

anatech · 28th June 2006, 01:49 AM

Gee tubelab.com,
I thought for sure you must have with all the amps you've played with. Oh well, my mistake.

Quote:

I have a pretty good selection of P-P transformers to play with, so I haven't bought any in several years.

You sure are a lucky man! Just not enough time I guess.

-Chris

ray_moth · 28th June 2006, 10:30 AM

I keep referring people to Max Robinson's site - I must be sounding like a cracked record by now! However, he has been experimenting with Edcors recently (PP only, he's not really into SE) and he, at least, seems pretty pleased with them. Here is his ultralinear amp design URL, in his "Fun with Tubes" web site.

Hojvaelde · 28th June 2006, 02:08 PM

I know Edcor but they will not send to Europe.
They only want to send the trafo's by airfrigth so the frigthbill is higher than the bill for the trafoes.

Benny

wrenchone · 28th June 2006, 06:13 PM

Max Robinson's site evaluates a transformer from Edcor's "expensive" push-pull line. I'm interested in the cheap product line, notably the 8k 10W transformer, the smallest in that series. This translates to 2k/side, and may allow one to squeeze 10W out of a pair of 6GF7s pushed very hard. (Can that little triode actually dissipate 10W?). Given the price for the "budget series" Edcor transformers, the experiment will be relatively painless for the pocketbook.

wrenchone · 30th June 2006, 04:39 AM

Just to throw a small wrench in the works, I'm thinking of using a small switcher tp power the single ended 6GF7 amp. What I envision is a fairky large "lump in cord" AC transformer outside the box. Rectified and filtered, this would power the filaments via a current source, and also power a DC-DC converter for HV and bias similar to the ones that drive CCFL tubes.

27th June 2006, 11:06 PM	#1
wrenchone diyAudio Member Join Date: Feb 2004 Location: Silicon Valley	Edcor P-P Transformers I'm thinking of using the 6GF7A in 2 flavors of amp - a low wattage single ended and a ~10W push-pull. I'm looking for cheap iron for both projects. I've seen consinderable discussion of the inexpensive Edcor single ended transformers (I'll probably use them for the SE amp), but not of their push-pull line. How do these sound compared to the usual contenders?

28th June 2006, 12:26 AM	#3
rdf diyAudio Member Join Date: Jun 2004 Location: the thermionic past	Have you seen this site? http://www.angelfire.com/electronic/...0_W_4_6L6.html __________________ Blame the Manichaeists

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28th June 2006, 12:02 AM	#2
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi wrenchone, I am pretty sure Tubelab.com has played with them. I'm just waiting until he drops in. -Chris

28th June 2006, 01:40 AM	#5
wrenchone diyAudio Member Join Date: Feb 2004 Location: Silicon Valley	I've seen the site with the comparisons for the 50W 6L6 circuit - interesting. However, I'm more interested in how the $17 Edcor P-P transformers sound. I guess I'll be finding out for myself...

28th June 2006, 10:30 AM	#7
ray_moth diyAudio Moderator Emeritus Join Date: Jan 2004 Location: Jakarta	I keep referring people to Max Robinson's site - I must be sounding like a cracked record by now! However, he has been experimenting with Edcors recently (PP only, he's not really into SE) and he, at least, seems pretty pleased with them. Here is his ultralinear amp design URL, in his "Fun with Tubes" web site.

28th June 2006, 02:08 PM	#8
Hojvaelde diyAudio Member Join Date: Jan 2005 Location: Denmark	I know Edcor but they will not send to Europe. They only want to send the trafo's by airfrigth so the frigthbill is higher than the bill for the trafoes. Benny

28th June 2006, 06:13 PM	#9
wrenchone diyAudio Member Join Date: Feb 2004 Location: Silicon Valley	Max Robinson's site evaluates a transformer from Edcor's "expensive" push-pull line. I'm interested in the cheap product line, notably the 8k 10W transformer, the smallest in that series. This translates to 2k/side, and may allow one to squeeze 10W out of a pair of 6GF7s pushed very hard. (Can that little triode actually dissipate 10W?). Given the price for the "budget series" Edcor transformers, the experiment will be relatively painless for the pocketbook.

30th June 2006, 04:39 AM	#10
wrenchone diyAudio Member Join Date: Feb 2004 Location: Silicon Valley	Just to throw a small wrench in the works, I'm thinking of using a small switcher tp power the single ended 6GF7 amp. What I envision is a fairky large "lump in cord" AC transformer outside the box. Rectified and filtered, this would power the filaments via a current source, and also power a DC-DC converter for HV and bias similar to the ones that drive CCFL tubes.

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