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opinion of using a 6SN7 over a 12AU7 in an amp driver boards

sKiZo said:
Y an RCA coin base (cheap and plentiful)

BIG fan of the dbx expanders. have had a 3BX in the loop for decades now and it really brings the music to life. Fairly bulletproof too - I crank it hard and only time I've popped the case was to clean the switches, and replace the caps on the power supply as I was already in there and what da hey, eh ...

** As with any processor, moderation is key. Some folk complain of "breathing" using a 3BX, but I suspect it's usually setting the expansion too high at the wrong expansion point. Kinda like a PEQ that has dual controls to set the frequency and band width - takes some experimentation. Good place to start on the 3BX is midpoint on both sliders, then small tweaks as you listen. You'll know when you've got it right.
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very good--now i dont have to make
a post
about it. thank u very much, my man!
 
Now, if you REALLY want to go down the rabbit hole, consider a tube buffer. I use a Maverick TubeMagic D1+ (killer DAC btw) inline with the preamp input for that. We know different tubes and mfgs sound different, and the buffer adds another level of control to what you hear. The output of my amp's current tube set alone is a bit dark for my tastes, but using a brighter tube in the buffer makes it just right.

Some talk of swapping resistors to fine tune a 12AU7 amp like the Dynaco or Latino for a 6SN7 - wouldn't be all that difficult to add a daughter board with multiple resistor sets to cold switch multiple tube types that the amp can handle. And worth repeating if it's not already been said - vintage virgin Dynacos and their like are pushed pretty hard using the stock tube types, and it's strongly suggested against using anything (like the 6SN7) without upgrading the iron to handle the extra load. The stock 5AR4 rectifiers are also borderline as well, but I get around that using a GZ37 in mine. The solid state versions are also an option - I'll let someone else chime in on solid state vs digital rectifiersand their potential effect on overall "tubyness" of the amp's sound ... ;-}

:lurk:
 
Lavane said:
Nope. :D I have seen old B&W and even old color TV's turned into VU meters.
It looks pretty cool. Its pretty easy to. You just have to be careful with all those volts.
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I had a plan to adapt a game console into a stereo lissajous color sonic display years ago, unfulfilled.
 
Just repeating what has already been forwarded in this thread before: The 12AU7/ECC82 is less linear than the 6SN7 (no matter how one twists and turns...).

If a somewhat higher amplification factor is no problem in the actual circuit, the E80CC (already proposed in this thread, having a Noval base) or the ECC40 (having a Rimlock base) are good options when compared to the 6SN7.

Off topic: The ECC40 is a real sleeper when used as a long-tail phase splitter. Just look at the data in this datasheet on page 4 under A. Know when comparing this data with other tubes that the distortion numbers are about proportional to the output voltages.

https://frank.pocnet.net/sheets/030/e/ECC40.pdf

I used the ECC40 in SRPP mode in the first stage of my headphone amplifier, much to my liking:

https://audiokarma.org/forums/index.php?threads/driving-antique-headphones.1008292/#post-15905545
 
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