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6SN7 Tube Addicts - Page 206

post #3076 of 4042

Where do the RCA red base 5692s fit in?

post #3077 of 4042
Thread Starter 

Maybe we can consider the RCA Red Base as a variant of the brown base?

 

I don't have a Sylvania Black Base, but I think they also exist. 

post #3078 of 4042
Quote:
Originally Posted by rosgr63 View Post

 

Congratulations, The Super 7 is a fine amp.

What 6SN7's do you plan to use?

 

Thanks, looking forward to it. My 6SN7 collection is even more sparse than I recalled. I currently have:

 

1 pair Tung-Sol JAN CTL 6SN7WGTA (Manuf. Date June 1964) (Brown base)

1 pair Sylvania JAN CHS 6SN7WGTA (Manuf. Date Jan. 1966) (Brown base)

 

That's it for now. We'll see how each of these sounds in the driver position and go from there.

 

Anyone with specific Super 7 suggestions is welcome to post them here... there are many other observations here and elsewhere, of course.

post #3079 of 4042
Thread Starter 

These nice WGTA's are a good starting point.

 

I would experiment with some single drivers like an RCA smoked glass, an early Tung-Sol and a T-plates Sylvania before going into more output pairs.

 

The driver usually makes a bigger change than the output tubes.

post #3080 of 4042
Quote:
Originally Posted by rosgr63 View Post

Maybe we can consider the RCA Red Base as a variant of the brown base? 

 

That's fine. I was wondering whether there is one that is distinctly red and one that is distinctly brown as opposed to perhaps a continuum of reddish browns.

post #3081 of 4042
Quote:
Originally Posted by rosgr63 View Post

These nice WGTA's are a good starting point.

 

I would experiment with some single drivers like an RCA smoked glass, an early Tung-Sol and a T-plates Sylvania before going into more output pairs.

 

The driver usually makes a bigger change than the output tubes.


just to make sure i understand it right..output tubes=power tubes... right?? i understood from the one i bought my amp is that the power tubes makes biggest impact on sound and not the drivers....but maybe i understood it wrongly? my 337 only has driver tubes (smaller tubes) and the power tubes (bigger tubes)..so now hearing the drivers makes more impact on sound makes me a bit confused...

post #3082 of 4042
Thread Starter 

The output tube is the power tube, the 6AS7G is the output tube.

 

In a lot of designs the driver affects the sound the most.

 

Some amps use a driver(s), an input(s) and output(power) tubes.

post #3083 of 4042
Quote:
Originally Posted by rosgr63 View Post

The output tube is the power tube, the 6AS7G is the output tube.

 

In a lot of designs the driver affects the sound the most.

 

Some amps use a driver(s), an input(s) and output(power) tubes.


oh ok..thanks for explaning..didnt know that..so now i just have to find out myself which of the two affects the sound the most on my 337..well..i have 3 pairs of driver tubes (tung sol, rca reds, sylvania's) and 3 pairs of output tubes (bendix/tung sol/chatham)..so i am goin to have lots of fun finding out.. biggrin.gif


Edited by hifimanrookie - 12/20/12 at 6:14am
post #3084 of 4042
Quote:
Originally Posted by rosgr63 View Post

Maybe we can consider the RCA Red Base as a variant of the brown base?

I don't have a Sylvania Black Base, but I think they also exist. 

Actually, I think all RCA 5692's have a red base, not brown, if we are being picky about it wink.gif
post #3085 of 4042
Thread Starter 

Yes they are, so the list will change to:

 

 

 5692 List

 

I know of the following 5692's, maybe others can help to complete the list, there also rebrands but these are the main ones:

 

GE

Brown & Black Base

 

RCA

Red Base

 

CBS/CBS-Hytron

Brown & Black Base

 

Sylvania

Brown Base, Medium Bottle (Yellow Label) and Short Bottle (Green Label)

post #3086 of 4042

I have found on the WA22 that the rectifier tube seems to have the most dramatic effect on the sound. Also, I have found that the sound can very significantly just mixing and matching rectifiers with different driver tubes. One driver is great with a certain rectifier, and worse with another. But I'm just a young pup around here :).

Quote:
Originally Posted by rosgr63 View Post

The output tube is the power tube, the 6AS7G is the output tube.

 

In a lot of designs the driver affects the sound the most.

 

Some amps use a driver(s), an input(s) and output(power) tubes.

post #3087 of 4042
Thread Starter 

Very valid points, thanks.

 

Don't forget there are amps that use SS rectification.

post #3088 of 4042

Yeah, definitely. That's why I mentioned my observations applying specifically to my WA22. I wonder how much the power tubes would impact things. I have had the Sylvania 7236 from day one and have never rolled anything else there. I have only tried recitfiers and driver tubes so far.

Quote:
Originally Posted by rosgr63 View Post

Very valid points, thanks.

 

Don't forget there are amps that use SS rectification.

post #3089 of 4042
Quote:
Originally Posted by Sid-Fi View Post

I have found on the WA22 that the rectifier tube seems to have the most dramatic effect on the sound. Also, I have found that the sound can very significantly just mixing and matching rectifiers with different driver tubes. One driver is great with a certain rectifier, and worse with another. But I'm just a young pup around here :).

Rectifiers with different amounts of voltage drop will affect the operating behavior of all the other tubes, so it can indeed have a strong affect on the sound.  The quality of the power supply is a large part of how an amp performs and the rectifier is the heart of a tube amp's power supply.

post #3090 of 4042

So I got an order from Vacuumtubes.net, accepting substitutions (no pics or detailed descriptions on their site anyway). Which is like Forrest Gump's box of chocolates: you're never quite sure what you'll find when you open the box. In this case my first Mullard-type GZ37 turned out to be from a brand called Zaerix (Z & I Aero Services Ltd., London, England) and I'm quite enjoying it, seems pretty mellow in the current setup.

 

But more on topic, I got my first couple of supposed Tung-Sol 6SN7s, of which one turned out to not be a Tung-Sol... not sure if it was a substitution as such since somebody hand-wrote Tung-Sol on the box anyway and they may not have checked inside. They are both clear glass tall bottle w/ top getter & angle plates, look identical and measurements are pretty similar, certainly in the same range I'd get from a pair of other actually identical-make tubes. I can't hear any particular issue left to right myself.

 

Anything I should concerned about? The make is "Reliable", not familiar with them. See pic below, it's the one in the foreground (Tung-Sol in the back)

 

700


Edited by TheGrumpyOldMan - 12/23/12 at 10:06pm
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