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Old 27th May 2010, 07:16 AM   #1
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Default 6J5 or 6S4 mic amp?

I am looking to build an amplifier that i can talk into and then send it out a speaker out a fair volume using a 6J5 and/or 6S4 tube.
Any schematics available? the simpler the better.
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Old 28th May 2010, 05:59 AM   #2
jfitz57 is offline jfitz57  United States
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LM386 (Radio Shack)

Jim
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Old 30th May 2010, 01:50 AM   #3
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I was looking to do that just to practice with tubes.
I could already make a solid state amp with some old pnps but it didn't work 'great'
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Old 30th May 2010, 11:52 PM   #4
jfitz57 is offline jfitz57  United States
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A single triode will not do what you want. The mechanically simple way to do it is with a multi section tube like a 6dr7 or 6em7 or one of the many "compactron tubes" <- google that.

Jim
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Old 31st May 2010, 05:47 AM   #5
mltube is offline mltube  United States
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Default Simple mic amp

Simpler yet would be to use a 6eh5 and 12ax7. Filaments can run off a cheap 6v 1.5A RadShac tranfo, and B+ can use couple of wallwarts connected as Isolation transformer.
The 6EH5 will be happy at 110-120vdc @1.5w output, and is about as simple a circuit as I could think of. Schematics for this type of amp are available in the circuit section of old RCA tube manuals, RC20 I think.
They are available as complete free download from pete millett's site.
"THANKS, Pete for all your hard work!"
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Old 31st May 2010, 09:27 PM   #6
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Unfortunately, i do not have either of those tubes, i do have these though:
Code:
117p7 ?
12at6 good
12at7 good
12at7 good
12au7 bad
12au7 good
12au7 bad
12au7 bad
12ax4 good
12ax4 good
12bh7 weak
12by7 good
12cu5 good
12cu6 good
12sk7 good
1b3 good
1ln5 good
3q5 good
45 ?
5an8 good
5aq5 weak
5aq5 bad
5br8 good
5t8 good
5u4 good
5u4 good
5u4 weak
5u8 good
5u8 good
5v6 good
5y3 very weak
5y3 weak
6ac7 good
6ag5 good
6ag5 good
6ag5 good
6ah6 good
6al5 good
6al5 good
6al5 good
6al5 good
6al5 weak
6al5 good
6an8 good
6as5 good
6au6 good
6au6 weak
6au6 good
6av6 very weak
6av6 good
6av6 good
6av6 bad
6aw8 good
6ax4 good
6bq6 / 6cq6 good
6bq7 good
6cb6 good
6cd6 good
6cd6 good
6cg7 good
6cg7 good
6cg7 good
6cg7 good
6cg7 good
6cg7 weak
6cg7 weak
6cg8 good
6dq6 good
6j5 good
6j6 good
6j6 good
6j6 good
6k6 good
6s4 good
6s4 weak
6sh7 good
6sl7 good'
6sn7 weak
6sn7 weak
6t8 good
6u4 good
6v6  weak
6v6 bad
6v6 weak to good
6w4 good
Pš
 *** END : 86 items sorted ***
Thanks for the suggestion anyway.
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Old 1st June 2010, 05:13 AM   #7
jfitz57 is offline jfitz57  United States
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I see a few that will work like 6SL7 + 6V6. What else do you have besides the tubes?

Jim
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Old 1st June 2010, 06:02 AM   #8
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A big box of npns, pnps and some resistors and capacitors, some audio output transformer, a regulated 5.8v wallwart, regulated 11v wallwart, unregulated 12v wallwart (actually puts out 17), 30v wallwart, 35v wallwart.
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Old 2nd June 2010, 04:33 AM   #9
jfitz57 is offline jfitz57  United States
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What about sockets and something to mount them and the other stuff to?
It's way different than a perf board with some tiny transistors on it.
What about a B+ supply?

Jim
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Old 3rd June 2010, 02:48 AM   #10
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I think i can come up with a supply as high as 150vdc, as for tube sockets well ughh, i will have to buy some.
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