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RE: Agree ......

184.6.67.144

In Reply to: RE: Agree ...... posted by hennfarm on April 14, 2013 at 19:24:00

Hi hennfarm,
You state:
"Jeff, if you can live with that transformer tower great."
Yes JH, once I mod the top cover, I can live with that. I think it is a great "DIY visual", and people who see it understand right away what was done.
"Have you considered going to a larger core outboard transformer? Or leave a single tx onboard and separating the analog pwr to a separate tx?"
Yes, I have considered that. Need to get a shop manual for that. This was just an EASY basic substitution and a "proof of concept" project, .....worked out well.
"I don't use any fancy wire but my CDP analog DC uses a over spec. Tx and fast diodes."
I've find wiring, ( type and amount in parallel) to transfer instantaneous PEAK energy, is important. I found ( on this CD player ), I had to redo ALL the wiring from the power cord through the secondary lead outs, to the plug into the CD player's circuit board, to get the full benefit.
I had to even "wire-out" the AC fuse, with a user-selectable "in-out" switch, as the AC fuse was impeding the dynamics that the triple trannies and good wiring was capable of bringing to the music playback.
My work-in-progress two stage SE prototype amp ( 12AY7 direct coupled to a triode-connected 6AQ5 ) is similarly wired. The overall result of both pieces together - is good.
"Fun stuff at any rate....JH"
Agree with you fully....thanks for commenting and posting. ... Jeff

Edits: 04/15/13

Follow Ups:

RE: Agree ...... - Saturntube 08:47:52 04/23/13 (2)
Excuse my ingnorance Jeff, how do you parallel the trafos and what do you gain in terms of power?

Great project!

How is that amp coming along?

Cheers

Jorge
- Whoops.... - drlowmu 23:33:58 04/28/13 (0)
  Jorge,
  I didn't answer "how to parallel power transformers."
  First of all, I had FOUR exactly-the-same Philips model number power transformers from circa 1986 CD players. I just paralleled with TWO Kimber Kable TCSS runs, the terminals of the trannies, one to the other, on both the primary and secondary sides. "Big loop" ( see photo ) required on the first to second power trannie secondary - first three runs - to clear the drawer mechanism.
  I initially Jorge tried two power transformers in parallel by clip leading with 8 clip leads, two trannies together. It became better sounding with two, but clip lead connections and wires sound like doggie - doo. So after TRYING two with clip leads, I double TCSSed the runs, soldering them in place. Cool.
  I also used 6/32nd threaded rods, and 6/32nd nuts, to "stack" trannies vertically. It was a trip to the local hardware store.
  I also carefully replaced the ultra-thin wire on the stock 9 pin power supply connector with TCSS, single runs.
  Eventually, I did this paralleling with three power trannies as shown above, and it was way better than two, and almost perfect with three.
  Four in parallel, however, was easily the best result, IF using one trannie to simultaneously do ALL the functions of the CD player.
  But I KNOW (now) that it will take low DCR .......and .......SPLITTING up of functions, to get the best result. My Romanian friend, who IMHO is an EXPERT, tells me splitting of power supplies, into different functions, powered by a separate transformer ( so the grounds, etc, do not "talk" to each other ) is THE most effective and important thing to do to modify any old CD player.
  My testing over this weekend briefly shows him 100% correct.
  BUT, it also needs to be LOW LOW LOW in DCR .... " Jeff's Thing ".
  I will use Signal Transformer Company's A41 power trannies, to replace all this stacking, and I believe the A41s models that are VA-rated at 130 VA will do nicely.
  Obtain a SERVICE manual on your CD player before doing this work to confirm what you visually can see.
  Jeff Medwin
  
  Edits: 04/28/13
- RE: Agree ...... - drlowmu 16:11:21 04/28/13 (0)
  Hi Jorge,
  
  Need to get digital source squared away, before I can FINE TUNE Rk bypassing on my SE DC amp Jorge.
  
  Patience I am sorry to say !! I had other ( quicker ) hopes originally, didn't I ? !!
  
  Jeff Medwin

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