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    Building, troubleshooting and testing of these amplifiers should only be
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    the safety precautions around high voltages.

Are 6DZ7 to Rare to be fun?

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astouffer said:
Tom you must mean a 6DZ7. They probably weren't made in large quantities to begin with. I think theres one guitar amp that used a 6DZ7.


6DY7 was a common replacement for the 6DZ7.
http://www.nostalgiaair.org/tubes/6dy7.htm


I have 1 6DZ7 in my collection and have been looking for a few more, But they do not seem to turn up often on fleabay.

My thinking is in my crowded chassis in my combo guitar amp I can free up the space of 1 octal and use the extra room for a reverb driver.

Then of course I had a couple other ideas also, Like a 36W bluesbreaker :D


Trout
 
6DZ7 is basically a dual 7189. 6DY7 is closer to a dual 6L6, though of course limited in dissipation. They can be interchanged to some degree by adjusting bias... drop 6DZ7s into the Stromberg ASR422 and they'll be biased in class C unless you make some resistor changes.

One of the Strombergs passed through my hands - I sold it for a friend. Details on this amp are on my web page: http://www.audiophool.cjb.net/MadeInRoch.html
 
Jaime said:
This is very interesting

http://www.audioasylum.com/forums/tubediy/messages/12/124726.html
Y.C : (hcyoon@monotec.co.kr

Best regards Jaime

Cool schematic at that site. That tube sure lends itself to less wiring and simple designs.
To bad a current company has not picked up on these yet.

When they do turn up it seems that most sell for under $25.00 US which is still cheaper than the 2 tubes needed to replace them.

Trout
 
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Another cool PP-Amp using 6DZ7s was published in AudioXPress Feb. 2006 pg. 6 .
"Clamped Bias, AB2, RC-Coupled Amp" by Jim Carlyle.
This article also contains some other interesting feats for tube aficionados.
(Time to get a back issue, ladies & gent's ?)
Greez

Siggi K.
 
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Tom Bavis said:
I have a pair... probably will save them in case I run across a Stromberg ASR-422 - that used 6DY7s, which have REALLY become unobtanium.


Hi Tom,
I had an ASP-422 stereo amplifier about 16 yrs ago, what a nice sounding little amplifier. I don't remember much about it, unfortunately I needed money rather badly at the time and quickly sold it to a collector. I have never seen another one anywhere. The 6DY7 were completely impossible to find even then, and I remember very clearly that the 6DZ7 was not nearly as good sounding in that amplifier compared to even the tired 6DY7 it came with. (This required a change in the bias supply to use it.) The buyer actually had a couple of nib 6DY7 and so was going to restore the amplifier to use that tube instead of the 6DZ7s I had fitted.

I looked at your page, and the amplifier you photographed had a lot of modifications.
(Hum pots, balance pots, and the bias jacks are not OEM, but you probably knew that..:D )
 
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