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Old 29th September 2003, 04:28 AM   #1
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Default Seeking 6AQ5's Curve Chart

Hello. I'm new here. In recent days, I get facinated with the minature tube 6AQ5 and is eager to build a amp. with it as the power tube. To better understand this tube, I decide to find its curve chart for further study. However, what is disppointing is that it takes me a long time to look for such chart with no result, though it is said that this tube was once very popular, particularly in WWWII and is still in large stock today. I'll be really appreciated if anybody would share concerned information with me.

PS.: The most interesting chart for me is the one describing the relationships between its output power, the distortion rate and the plate load resistance. I want to figure out the optimal plate load resistance.

Looking foward to your warm help. Thanks in anticipation.
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Old 29th September 2003, 09:17 PM   #2
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Hi,

Actually it's a small beam tetrode. 6AQ5/EL90 good 4.5W dissipation as a SET.

You can have a look here:

DUNCAN AMPS

Cheers,
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Frank
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Old 29th September 2003, 10:38 PM   #3
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Following the links there, we find a 6 page GE data sheet : http://www.mif.pg.gda.pl/homepages/f...093/6/6AQ5.pdf

and a 10 page Lorenz data sheet: http://www.mif.pg.gda.pl/homepages/f...093/6/6AQ5.pdf

both have the distortion vs. power output curve.
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Old 30th September 2003, 02:45 AM   #4
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You can also try this:

Franks Tube Pages
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Old 30th September 2003, 03:04 AM   #5
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OK, I screwed up the link to the Lorenz data sheet (both are on Frank's site mentioned above). It's http://www.mif.pg.gda.pl/homepages/f...062/e/EL90.pdf

The Lorenz data sheet is the one I used to design the 6AQ5 amp here: http://www.audiophool.cjb.net/Audio.html
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Old 30th September 2003, 04:09 AM   #6
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Sincerely thank you all.
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Old 30th September 2003, 07:00 AM   #7
Zombie is offline Zombie  Sweden
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Hi, must say your choice is good!
I have a vintage Voice of Music 1448, which uses 4x6AQ5 and 3x 6EU7. The sound is good and "compact", I use it for rock n roll mostly...
A full set of NOS valves for the 1448 cost less than one NOS GEC KT66 for my Quad IIs!
Good luck!
Tom
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Old 30th September 2003, 11:08 AM   #8
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Default Is Voice of Music 1448 a PP machine? or a SE with each two 6AQ5s for each channel?

Nice to meet you, Zombie.
Is that machine, Voice of Music 1448, a P-P one? I know little about vintage gears, and I find on the web that 6EU7 is a twin triode, so I guess the usage of the three 6EU7s is: one for preamp, two for phase spliting of each channel and naturally the four 6AQ5s are working in P-P mode. How much is its output power, 10 Watts? Have you ever compared 6AQ5 working in SE mode and P-P mode? Sorry for so many questions. I am very interested in what kind of magic this small beam tube is going to show me.
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Old 30th September 2003, 12:07 PM   #9
Zombie is offline Zombie  Sweden
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Hi Kenneth!
It's a P-P and it's 25W per channel on the spec sheet.
I haven't compared P-P vs SE. I will change all the caps and some other components first, later maybe I will experiment with it.
There might be smth about the 6AQ5 on Audioasylum
Do the search in the relevant forums, like Tubes, DIY and Vintage.
Cheers,
Tom
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Old 30th September 2003, 01:07 PM   #10
Colt45 is offline Colt45  Serbia
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its a 6V6 electrically, just the ratings are reduced to 250/250v (Va/Vg2) instead of the standard 315/285v. i think Pa is also only 10w instead of 12w.

i didnt think it was around in WWII though, i thought it was developed later on.. (after 6V6 but before 6BQ5)
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