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Old 5th November 2002, 12:21 AM   #21
richt is offline richt  Puerto Rico
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Join Date: Nov 2001
Location: puerto rico
salute again !


SORRY FOR MY MISTAKE !

i was confused. the tube wasnt 6c33, it was an 6h30 !
recently used on mark levinsons pre & power.

on the counterpoint the cathode is tied to ground.
(checked literally & seen on schematic)
m. e. philosophy of zero feedback.

in this way the tube tends to draw a lot of current !
22k ohm resistor that almost burned the pcb, and sounded
very harshy (50 vdc on plate)

i replaced that resistor with a 100k ohm & dropped to 37 vdc
& sounded great, no harshiness at all !

i am happy with my pre but as diy as us in the quest for the holy grail , i was wondering if there a difference with the 500 ohm
resistor on the cathode tied to ground.

for my personal opinion , i dont like to use any solid state device
for the tubes because the experience that i had switching from
s.s. to tube rect was huge.

2 weeks ago i repaired a mark levinson latest pre to a local audiophile store.i dont remember the model but was the mnodel
with full wireless remote, a lot of nice functions, 6h30 on the outputs & a solid state harshy sound.

the price was over 2000 bucks & made a listening test one nite
and i was happy !!!!!!

all my mods worth it !

i feel that on audio chain simpler designs are better.

i have 2 mcintosh mc 75 amps heavily modified,

removed 2 tubes (no feedback & no 600 ohm option for pa)
triode mode
class a/ab with a flip of a switch
now am tryng to remove the s.s. diodes to tubes.

another proyect that i have is an power amp coupled with transformers. (no caps on the audio chain)

lets see what happens.

thanks
richt
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Old 5th November 2002, 12:45 AM   #22
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Location: Belgium
Default KONTRAPUNKT III

Hi Richt,

It is pretty hard to explain everything in just a couple of posts but here goes:


Quote:
i was confused. the tube wasnt 6c33, it was an 6h30 !
Mark Levinson using tubes?? Need to double check but what else is new.
Those tubes can't be interchanged with the one you got so better forget it.



Quote:
on the counterpoint the cathode is tied to ground.
Alright,so the cathode is tied to ground.Then you should look for a resistor from grid to ground (~10M if memory serves me correctly)


Quote:
m. e. philosophy of zero feedback.
No,nothing to do with feedback really.


Quote:
(50 vdc on plate)
That's not correct,a 50 VDC drop across is more likely.

Quote:
i replaced that resistor with a 100k ohm & dropped to 37 vdc
That's a very high value for a 6922 anode resistor but if you're happy so am I.

Quote:
for my personal opinion , i dont like to use any solid state device
My philosophy entirely.But you still have some in the circuit and I don't want to tempt any devils here.

And I still don't know much more then last post to be quite frank with you.Line stage? Phono section.

BTW,since you seem to have the circuit diagram,why not scan it in and e-mail it to me?
You can then show your changes on a copy of the original perhaps?
It would make my guesswork a lot easier.

Regards,
__________________
Frank
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Old 5th November 2002, 01:09 AM   #23
richt is offline richt  Puerto Rico
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Join Date: Nov 2001
Location: puerto rico
hi frank

sorry , i read fast my logbook of equipment for service and
the pre is an audio research, the mark levinson was an power amp. nothing to do with our discussion. sorry

i rechecked the schematic and the cathode is tied to ground plane !

i dont have a scanner right now.



J = plate with 37 vdc from 100k res.
---- = audio in from volume pot. 0 vdc
T = tied to ground

thanks for your time
richt
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