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2359glenn | studio - Page 351

post #5251 of 10672

That's right George!!!

 

What make are your 6336's, Cetron?

post #5252 of 10672
Thread Starter 

Nice "avi", rosgr63!

post #5253 of 10672
Quote:
Originally Posted by rosgr63 View Post
 

That's right George!!!

 

What make are your 6336's, Cetron?


I have different ones that started collecting from last year.  Some Centons, TS, RCA, and a pair of CSF.  Even one from Pinnacle, but its most likely a rebrand from a USA maker.  I dont believe the UK made any 6336 tubes.  I could be wrong though. 

post #5254 of 10672
This may be sacrilege, but I figured I'd ask here... I see many of the 2359G designs use tube rectifiers, as does the woo 2/22. Does having a diode bridge change the sound that much? Same Q for constant current sources vs the resistor. My current FrankenWA-3 has a current source in the bottom of the OTL output and FREDs in the bridge. I know some dislike silicon anywhere in amp (other than the glass envelope).

I was thinking of doing the same to a WA-2...but it also has tube rectifier that I was thinking of replacing with solid state....which would also get me higher B+ to work with. The other direction I was toying with was to get a second WA-3 and make mono blocks out of them, I also loved your multi-6SN7 concept....hmmm, crazy thoughts I have. smily_headphones1.gif
post #5255 of 10672
Glenn, can C3g and 6SN7 interchangeable? Like with an adapter?
post #5256 of 10672

You can buy a SS tube rectifier that will replace the tube and still plug in with the tube socket. It is available on Amazon around $15 or so. However you would have instant B+ voltage before the tube had a chance to warm up. This may reduce tube life without a B+ voltage delay. With some amps you may have to rebias the rest of the tubes.

 

Quote:

Originally Posted by GrindingThud View Post

This may be sacrilege, but I figured I'd ask here... I see many of the 2359G designs use tube rectifiers, as does the woo 2/22. Does having a diode bridge change the sound that much? Same Q for constant current sources vs the resistor. My current FrankenWA-3 has a current source in the bottom of the OTL output and FREDs in the bridge. I know some dislike silicon anywhere in amp (other than the glass envelope).

I was thinking of doing the same to a WA-2...but it also has tube rectifier that I was thinking of replacing with solid state....which would also get me higher B+ to work with. The other direction I was toying with was to get a second WA-3 and make mono blocks out of them, I also loved your multi-6SN7 concept....hmmm, crazy thoughts I have. smily_headphones1.gif
post #5257 of 10672

I thought the major advantage to tube rectification was less switching noise than SS diodes, with the slow voltage ramp up being a nice side benefit?

post #5258 of 10672
My thoughts as well, although I've never been able to actually hear a diode switch after being buried under a pile of caps and chokes. smily_headphones1.gif
Quote:
Originally Posted by Xcalibur255 View Post

I thought the major advantage to tube rectification was less switching noise than SS diodes, with the slow voltage ramp up being a nice side benefit?
post #5259 of 10672
You cant here the switching it just makes the music sound harsh
post #5260 of 10672
Quote:
Originally Posted by jc9394 View Post

Glenn, can C3g and 6SN7 interchangeable? Like with an adapter?


No the C3g is a pentode and the 6SN7 is a dual triode. I can make the amp use 6SN7s would

prefer the C3g though.

post #5261 of 10672

Some amps like the SPs use SS rectification and don't sound that bad.

 

It depends on how they are implemented.

 

But if you go the way John has suggested replacing in an amp that's designed to use a tube rectifier with a SS one you may get horrible results.

post #5262 of 10672

Usually the amp designer chose the transformer with a specific rectifier tube with it's voltage drop in mind.

Using SS with a .7 volt drop can increase the B+ voltage by as much as 50 or 60 volts if a 5R4 tube was used.

This will defiantly change the operating points of the amplifier tubes and maybe go over voltage.

This is how changing rectifiers change the sound .A rectifier tube has no sound of it's own changing it to a different

tube changes the operating points of the amplifier tubes changing the sound.

 Normally I like to use a rectifier with the lowest voltage drop GZ37 and 3DG4 and for me TV damper diodes.

Damper diodes have the lowest switching noise of any rectifier. I did use damper diodes in Tyrell's 45 amp.

Now I would like to ween people off the 5U4 and switch them to damper diodes. many of them can handle

1amp - 1000ma of current and 5000 volts.

post #5263 of 10672

Come on Glenn, can't teach an Old Dog new tricks.........

 

Can you?

post #5264 of 10672
That's a clever idea.... I'm going to have to get some of those. smily_headphones1.gif
Quote:
Originally Posted by 2359glenn View Post

Usually the amp designer chose the transformer with a specific rectifier tube with it's voltage drop in mind.
Using SS with a .7 volt drop can increase the B+ voltage by as much as 50 or 60 volts if a 5R4 tube was used.
This will defiantly change the operating points of the amplifier tubes and maybe go over voltage.
This is how changing rectifiers change the sound .A rectifier tube has no sound of it's own changing it to a different
tube changes the operating points of the amplifier tubes changing the sound.
 Normally I like to use a rectifier with the lowest voltage drop GZ37 and 3DG4 and for me TV damper diodes.
Damper diodes have the lowest switching noise of any rectifier. I did use damper diodes in Tyrell's 45 amp.
Now I would like to ween people off the 5U4 and switch them to damper diodes. many of them can handle
1amp - 1000ma of current and 5000 volts.
post #5265 of 10672

I still had no luck finding spikes that fit the #6 screws. The buzz goes softer when I lift up the amp from the table, so less contact = less buzz.

I'm thinking of just gluing(?) spikes on it like SO did, hoping that will work, unless I do find some spikes that fit the screw thread

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