Derek92994's 700 Ser II White Oak conversion

[laatsch55]

LOL!!!!

 

[derek92994]

It doesn't get any better than what is in there. The electrolytics are just PS caps. Not audio path caps.

That's reassuring Joe. Very satisfied with the purchase.

 

[George S.]

That's reassuring Joe. Very satisfied with the purchase.

Been doing research on these. Like Joe said, and Perry said a good while back, quality parts and construction, even though China manufactured. The bipolar transistors and dual FETs appear to be Japan made Toshiba. At least that's what all the genuine NOS replacements appear to be. Those big yellow film caps at the outputs, I've read say "Made in Mexico", haven't seen any info on brand
How's your Acurus compare to your old PL preamp?

 

[derek92994]

Been doing research on these. Like Joe said, and Perry said a good while back, quality parts and construction, even though China manufactured. The bipolar transistors and dual FETs appear to be Japan made Toshiba. At least that's what all the genuine NOS replacements appear to be. Those big yellow film caps at the outputs, I've read say "Made in Mexico", haven't seen any info on brand
How's your Acurus compare to your old PL preamp?

They are close, Lee did a lot of work to the 3600, I noticed a slight coloring to the bass running it flat compared to the Acurus. Both excellent preamps, and both will remain in the system with the option to run either.
What I am hearing tonight is some very nice sound staging and imaging from the Acurus using a Pioneer PD-S501 CD player. I am not missing the loudness or tone controls at all. I think it was mentioned that the Acurus is very close to a direct connection from the source to the amp.

 

[derek92994]

George, here is the thread where Lee did the work to the 3600

https://forums.phxaudiotape.com/threads/jasons-phase-linear-p3600.5063/

 

[George S.]

George, here is the thread where Lee did the work to the 3600

https://forums.phxaudiotape.com/threads/jasons-phase-linear-p3600.5063/

Thanks! Haven't seen that thread, it'll be a good read.

 

[J!m]

Those caps are from Mexico and do not have a brand name. But they are in all the Aragon and Accurus gear so they must sound “decent” but also inexpensive. Perhaps, their construction was directed by Mondial and whoever they were made them to spac? I’ve not seen them in any other gear from any maker.

But I’ll say that if you like the preamp, this specific cap is the one to “roll” to find your nirvana.

I swapped mine “blind” (deaf) in the D2A but haven’t listened yet. If I was more clever, I would have put some terminals on the (shitty) board to facilitate swapping… I presume the Accurus boards are also single sided and pads lift easily.

 

[George S.]

Those caps are from Mexico and do not have a brand name. But they are in all the Aragon and Accurus gear so they must sound “decent” but also inexpensive. Perhaps, their construction was directed by Mondial and whoever they were made them to spac? I’ve not seen them in any other gear from any maker.

But I’ll say that if you like the preamp, this specific cap is the one to “roll” to find your nirvana.

I swapped mine “blind” (deaf) in the D2A but haven’t listened yet. If I was more clever, I would have put some terminals on the (shitty) board to facilitate swapping… I presume the Accurus boards are also single sided and pads lift easily.

Photos of the Acurus boards show double sided and plated through holes. Looks like a decent quality board. I appreciate the info on the big film caps.

 

[J!m]

Interesting they put better boards in their lower line…

 

[Gepetto]

Could well be CDE caps, they manufacture in MX

 

[Gibsonian]

Bigger tranny???? 5 watts!!!

Was the guru's suggestion, forget his name but he's a member here. He did same to Lee's Acurus as well pretty sure.

 

[J!m]

Makes no sense, but sounds better. I’ve heard from several sources.

 

[laatsch55]

Was the guru's suggestion, forget his name but he's a member here. He did same to Lee's Acurus as well pretty sure.

Modialfan----Kevin...

 

[derek92994]

Loose black wire on 2r
Should I go further? E.g Resolder Outputs on right channel? Hmmm

 

[derek92994]

Might as well resolder outputs on right channel backplane

 

[derek92994]

Touched up solder joints and cleaned the flux. Will reassemble and make sure wires going into control board are secure.

 

[derek92994]

30 minutes to find a screw driver that fits phoenix connectors, I need to be more organised. Re-assembling.

 

[derek92994]

Relay’s engaged on first power up.
figured out how to check bias, its 362 and 363.
Need exact values of what it should be.
Does amp need to be warmed up then check bias again?

 

[derek92994]

Lee Updated me, thank you.
Will put in main system and have a listen soon.
not too loud its 115am.
For reference, problem was relays not engaging all the time and sometimes static in right channel.

 

[derek92994]

Bias was about 362 cold and 340 warm.
giving the cosmetics a clean.