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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Re: Tuner fix tricks- 6AU6 picks for kicks? posted by Eli Duttman on November 30, 2006 at 17:25:58:
Eli Duttman,Good to hear from you.
The collection: Yes, I never intended to end up with so many 6AU6's- it's a case of realising I used quite a few, but also that they're so inexpensive- the Tung-Sols cost I think less than $1 each. The "Telefunken" EF94s are relabelled RCA, Brazil- and $2 each. The boxes, by the way, are old and several still had a cellophane wrapping, so I wonder if Telefunken bought and boxed RCA, Brazil output. Seems unlikely, but a $2 each I felt I couldn't go wrong- as a curiosity. Plus, Telefunken did relabel and box late GE 6201s as Telefunken.
I'm interested in your comment vis a vis RCA vs. Sylvania. All this 6AU6 interest is related to my complete retubing of the MR67 tuner. I was sort f set on using the Sylvania Gold Brand gold pin 6136. Did I simply fall for the cheap glamour of gold pins? -I am certainly a fan of RCA as well- I have new respect for the Command 5814A for example and I like a lot of there other tuner tubes- 6AV6, 6CS6, and am open to the possibility of using RCA "Command" 6136. I thought the Sylvania Gold Brand 6136s were just interesting- again a gold pin premium and steel pin military version seems as though it should be a high performance machine. This was interesting too in light of the Sylvania Gold Brand "GB-1252" that appear to be a premium, gold pin consumer 6678 or military grade 6U8A.
What makes a 6AU6 a good one- a high performer? What do you like about the RCA?
DIY: When I was poking around trying to learn something about the 6AU6, I came across someone who had designed a 1.5W integrated SET amplifier using the 6AU6 as a triode gain device- wiring across sections I think- and I forget the output tubes- -or were those the drivers- 12BA4 or some such. I'm always interested in this sort of project- giving new exciting work to ubiquitous tubes!
May I ask what tubes you're using or planning for your McIntosh MR71?
My MR67 choices:
McIntosh MR67
3- 6AU6> 1st, 2nd IF / 1st limiter :Sylvania Gold Brand 6136- gold pin -NOS
GE 6136 “Five Starâ€- grey pl halo- NOS > The original “McIntosh†6AU6s are GE
RCA "Command" 6136-NOS2- 6BL8 > L&R audio amplifiers:
Valvo E80CF / 7643- Philips/Hamburg- red label, military label- pinched waist- gold pin- NOS
12AU7 > MPX oscillator :
Siemens 5814A triple mica- test NOS
CBS 5814A, black plate- square gtr- test NOS,
RCA ‘Command’ 5814A blk pl- halo gtr- NOS
Valvo 6189- RTC- France- dbl getter sup- NOS12AT7 > 2nd RF amplifier, mixer:
Sylvania Gold Brand, gold pin 6201- NOS
Siemens triple mica E81CC-NOS6DS4 > Nuvistor 1st RF amplifier:
Amperex- NOS
6AB4 / EC92 > Oscillator
Telefunken EC92- Germany- NOS
6CS6 /EH90 > 4th IF, 2nd limiter:
Telefunken EH90- NOS
6U8 / ECF82 > MPX amplifier:
Sylvania “GB-1252"/ 6U8A - Gold Brand- -grey pl- halo- gold pin- NOS > I’ve never seen this version before
Sylvania 6678- “Communications Qualityâ€-grey pl- halo- NOS > These appear to have identical construction to the “GB-1252", only without the gold pins
RCA - 6U8A- black plate- stirrup getter- NOS6GHA [for 6U8] > MPX amplifier:
Amperex 6GHA- orange globe label- France- NOS > Modaferri recommends the higher gain 6GH8A in place of the 6U8 in MR67 .
6BL8 [for 6U8] > MPX amplifier:
Amperex PQ 7643- Hamburg- gold pin- NOS > I’ve also heard of people using the 6BL8/ECF80/E80CF for the 6U8. What do you think?6AV6/EBC91 > Muting amplifier:
Telefunken EBC91
Cheers,
Bambi B
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Follow Ups
- Re: Tuner fix tricks- 6AU6 picks for kicks? : Tubes for McIntosh MR - Bambi B 20:47:59 11/30/06 (1)
- RCA 6AU6A vs GE 6AU6A - Ray Moth 02:28:11 12/01/06 (0)
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