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Old 25th May 2007, 02:16 PM   #1
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Hi all,
I've just purchased a batch of NOS tubes in Israel. I got EL84, ECC88/6DJ8 , 5U4GB, 5R4GYB, 6080WA (RCA) and 6AK5 (RCA). The question is what can I do with the 6080WA and the 6AK5 . I bought them on a hunch at about $4 a piece.
Avi
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Old 25th May 2007, 04:41 PM   #2
kevinkr is offline kevinkr  United States
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6080 can be used in pushpull triode outputs, otl amplifiers, and as a series pass element in a tube based voltage regulator it is basically the same as a 6AS7..

http://www.mif.pg.gda.pl/homepages/f...137/6/6AK5.pdf
Should be good as a ccs, a pentode based voltage amplifier and probably works ok in triode connection as well.
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Old 25th May 2007, 07:24 PM   #3
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Thanks, this will help me.
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Old 25th May 2007, 07:31 PM   #4
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6080's also work rather well in PP amps with output transformers. Married to the 6H30's they can make a very nice 3 valve stereo amp.

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Old 25th May 2007, 10:39 PM   #5
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Hi,
Thanks. There's not much literature about the 6080WA. I wonder if you know of any amp schematics.
Thanks
Avi
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Old 25th May 2007, 10:46 PM   #6
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Hi,
The 6080 can be used exactly like a 6AS7 so just look for 6AS7 amp schematics, there should be some floating about.
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Old 25th May 2007, 11:16 PM   #7
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Lots of people use the 6080 as a cathode follower to drive high impedance headphones. I tried it as a line stage and could never get it quiet enough.
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Old 25th May 2007, 11:56 PM   #8
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Quote:
Originally posted by kevinkr
6080 can be used in pushpull triode outputs, otl amplifiers, and as a series pass element in a tube based voltage regulator it is basically the same as a 6AS7..

http://www.mif.pg.gda.pl/homepages/f...137/6/6AK5.pdf
Should be good as a ccs, a pentode based voltage amplifier and probably works ok in triode connection as well.

Kevin,

The data sheet suggests the 6AK5 is a linear high RF type. It should be reasonably low noise to do that job. Do think a 6AK5 with regulated B+ on both plate and screen would make a good 2nd gain block in a phono preamp? Gm is 5 mA./V. So, approx. 35 dB. of gain is produced with a 12 KOhm load resistor.

FWIW, my thinking is a 6922 section for the 1st gain block, a 6AK5 as the 2nd gain block, and a DC coupled cathode follower to buffer the O/P.
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Old 26th May 2007, 12:40 AM   #9
kevinkr is offline kevinkr  United States
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Hi Eli,
Seems worth a try.. I have a bunch of them that were gifted to me with the statement that they are both pretty versatile and sound good. Linearity looks decent from a cursory inspection of the plate curves/load line, and they are very inexpensive.
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