Planar Speaker Asylum

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Planar Speaker Asylum

RE: ESL 63 220 uf cap question

90.191.63.76

In Reply to: RE: ESL 63 220 uf cap question posted by Jonesy on October 03, 2016 at 17:51:35

AOme say the caps does not affect the sound much anyway, but I replaced mine with a 150 uF NP and a 47 uF MKP. Highs less grainy.
What resistors did you replace in the EHT?

Follow Ups:

warning... long and wordy answer... sorry - Jonesy 15:06:25 10/05/16 (4)
Many years ago I had replaced my failing EHT boards with ones that Kent was making and selling at the time. The design was based on the then current 988's. A few weeks later, Kent sent me some 100K +/- 1% resistors to swap out of that design in order to reduce the bias voltage a tad. Well, I totally forgot about them until recently dealing with Kent on having a bass panel sent in for repair. He reminded me about the resistors, and boy, what a difference it made when I made the switch. I'd gone all these years... well, you get the picture. Anyways, the resistor is located at the far edge of the EHT board. Unfortunately I can't find a picture on the net. And I don't recall what resistor it replaced. I believe it was just an initial batch he did back then, and then reached out with a resistor value he felt would work better, and currently uses on his boards.

Cheers!

Jonesy

"I know just enough to get into trouble. But not enough to get out of it."
- RE: warning... long and wordy answer... sorry - Zombie 04:20:18 10/07/16 (3)
  I have a 988 so maybe not needed.
  There's a resistor in a bridge that has changed with later models to increase the bias voltage. Maybe it is that resistor you changed. In that case I thought 82k was enough
  - RE: warning... long and wordy answer... sorry - Jonesy 12:52:01 10/08/16 (1)
    The resistor I changed out was 56.20k +/- 1%
    
    Cheers!
    
    Jonesy
    
    "I know just enough to get into trouble. But not enough to get out of it."
    - RE: warning... long and wordy answer... sorry - Zombie 13:37:02 10/12/16 (0)
      OK, thanks, I'll look at the schematic and/or contact kentaja
  - I'll see if I can find more info... - Jonesy 07:56:21 10/07/16 (0)
    Kent had told me the 988 design voltage was biased a little higher so the 988's could play louder. I don't know which model year that would have been. When the 988 EHT design was used for ESL 63 replacement boards, that resistor impacted the sound quality as well as being tough on the panels. Not sure if the same would hold true for your 988's.
    
    I'll see if I can find the old resistors and take a pic of my EHT boards.
    
    Otherwise, Kent may be the best person to answer this.
    
    Cheers!
    
    Ed
    
    "I know just enough to get into trouble. But not enough to get out of it."

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