Hi,
I doubt you'd need the gain of the SRPP + the xformer though.
The advantage of the SRPP is reasonable gain with lower Zo than an anode follower.
No point of tacking on a xformer there IMHO unless you'd do it for a different set of reasons.
You could also build a White CF with the 6DJ8s, no gain but very low Zo and plenty of current to drive even the most silly cable lengths.
Cheers,
I doubt you'd need the gain of the SRPP + the xformer though.
The advantage of the SRPP is reasonable gain with lower Zo than an anode follower.
No point of tacking on a xformer there IMHO unless you'd do it for a different set of reasons.
You could also build a White CF with the 6DJ8s, no gain but very low Zo and plenty of current to drive even the most silly cable lengths.
Cheers,
Well, my intention was to use the transformer to lower the gain (and output impedance).
The 6DJ8 would have a gain of about 30 (I guess), and the transformers has a ratio of roughly 3:1 with the secondasies in series. The gain would then be about 10, right? Still a bit high, maybe.
I guess I´d rather go for a choke loaded 12B4A.
The 6DJ8 would have a gain of about 30 (I guess), and the transformers has a ratio of roughly 3:1 with the secondasies in series. The gain would then be about 10, right? Still a bit high, maybe.
I guess I´d rather go for a choke loaded 12B4A.
But Frank, he needs 30Vp-p into 300 ohms, which is 100mAp-p - meaning a class A operating point (with ideal components) of 50mA, something a 6DJ8 can't do without melting.
A 6AS7 will run you a few dollars, don't sweat it. You said you have $300 to spare, now you're concerned with saving money and using junk components? Geez, that's what I do!
Tim
A 6AS7 will run you a few dollars, don't sweat it. You said you have $300 to spare, now you're concerned with saving money and using junk components? Geez, that's what I do!
Tim
Hi,
Tim,
I was replying to Fuling.
I assumed he doesn't need the same requirements for his line stage...
I'm well aware a 6DJ8 can't dump that kind of current.
Cheers,
P.S. While I like the 6AS7G idea for econimical reasons, it can do alot more than asked for...not that that's so bad per se.
Tim,
I was replying to Fuling.
I assumed he doesn't need the same requirements for his line stage...
I'm well aware a 6DJ8 can't dump that kind of current.
Cheers,
P.S. While I like the 6AS7G idea for econimical reasons, it can do alot more than asked for...not that that's so bad per se.
Fuling said:
i second the toroid option... and am I the only one who read that this guy is going balanced???
you don't need the cap, just get a 120+120:33+33 power trannie and load a differential pair of 6C45's
the PS can be another 120+120:33+33 trannie into a bridge and a clc filter to get anywhere from 150-220V.
to keep well under the $300 price a surplus toroid will work and you can add your own secondaries.
dave
This output tube will drive the load
http://www.mif.pg.gda.pl/homepages/frank/sheets/115/6/6528.pdf
It's availible at Antique Electronic Supply for $40.40
http://www.tubesandmore.com/
http://www.mif.pg.gda.pl/homepages/frank/sheets/115/6/6528.pdf
It's availible at Antique Electronic Supply for $40.40
http://www.tubesandmore.com/
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