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Old 26th March 2013, 06:55 PM   #1
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Default Any audio differences for EL-84 P-P OPT?

Looking into upgrading my EL-84 Maggie amp with new PP OPT and will probably get the Edcors. Looking at their site the choices comes down to 8K, 8.6k or 10k.

So what are some of the sonic differences between 8k and 10k? I noticed the Dynaco SCA have 8k and other amps use 10k. I'm just looking for a clean, sweet, focused and solid sound from this amp. Also, I'm keeping the same paraphase circuit that came with it.

Anyone with experiences listening to both trannies in a A/B testing?
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Old 26th March 2013, 07:18 PM   #2
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Edcor CXPP25-MS-8K are decent. I'd love to compare them to Dynaco Z565, but finding them around here isn't so easy. Not sure you'd notice any difference going 10k over 8k with Edcor.

jeff
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Old 26th March 2013, 08:07 PM   #3
TheGimp is offline TheGimp  United States
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Will the CXPP25 series fit on your chassis? If not, consider the GXPP15 series.
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Old 26th March 2013, 08:22 PM   #4
rmyauck is offline rmyauck  Canada
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10K is supposed to be better for cathode bias with the 8K fine with fixed bias.

I think Dave Gillespie's EFB fixed bias mod would a great one for improved output tube life, sonics, and a little more power. Lot's of info @ diytube under the ST-35.

The 25% UL winding Edcor offers is supposed to be better for EL84 tubes and that's what the Dynaco Z-565 had.

There was a thread where someone tore down a dead Dynaco Z-565 and it had 5 interleaved layers and they were surprised as it was quite complicated.

I read of a fellow in Europe doing the same with the Edcor CX PP and it only had 3 layers, but it is a less expensive one to buy compared to the replicated Dynaco ones. In all the overall cost difference is low as even the replicated Dynaco Z-565 is low priced compared to many alternatives.

Magnaquest was the first to clone a Z-565 one and it is a higher quality appearing one but the most expensive and well regarded. It is also exactly the same as the original even down to the 8 & 16 ohm secondary outputs.

Triode was next with their's, but it has 4 & 8 ohms. Dynakitparts followed with their version with 4 & 8 ohm secondaries.

Last edited by rmyauck; 26th March 2013 at 08:38 PM.
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Old 27th March 2013, 02:19 PM   #5
TheGimp is offline TheGimp  United States
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Rockysdad,

Check your chassis space. How much space do you have?

The Edcor 25W transformers have a footprint of 3.22" X 3.43" (X 3.81" Tall) and may not fit.

The Z565 is smaller at 2.5 X 2.19+" (X 3" tall) and is more likely to fit. Only the center to center dimension is given for one axis.

I replaced one set of transformers with Edcor 10W transformers and they fit fine. But the 15W transformers might not have fit. The 25W transformers certainly would not have fit.

The discussion of sound difference is moot if the transformers won't fit.
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Old 27th March 2013, 05:38 PM   #6
rmyauck is offline rmyauck  Canada
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Maybe you could mount them on a separate chassis (attached or unattached with a ground wire joining) with no sonic problems as I have tested transformers that way even with 6" added to the leads. Just route them the same way as the old ones passing by the speaker terminal area to avoid noise.
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Old 27th March 2013, 07:25 PM   #7
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I can recommend this:
TGL 20/002 INDEL - Transformer: speaker | Transfer Multisort Elektronik

I have used it a lot. It has low leakage inductance and sufficient amount of iron (100 VA)
The overall performance is excellent. I have not tested Edcor CXPP25-MS-8K but compared to Hammond 1608 this Indel is superior.
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Old 27th March 2013, 08:01 PM   #8
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Quote:
Originally Posted by TheGimp View Post
Will the CXPP25 series fit on your chassis? If not, consider the GXPP15 series.
Planning on rebuilding amp on another chassis. Size in this case doesn't matter...
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Old 27th March 2013, 11:34 PM   #9
TheGimp is offline TheGimp  United States
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Another couple of options from Edcor are:

EM0775-PP : 15W, 8K, 40%UL, Multiple secondary
EM0776-PP : 15W, 8K, 25%UL, Multiple secondary

I think I paid around $56 each for them a couple of years ago when I had them made. I've already paid the custom design charge.

They aren't listed on the web site, but you can order them.
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