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Old 24th March 2008, 07:57 PM   #1
Stixx is offline Stixx  Germany
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Default aikido heater

I have finished my breadboarded Aikido headphone amp (6CG7 and 6H30) so far that today I tested the heater part of the psu. It consists of a 9V 50VA toroid and a regulator that delivers 6.15V (thread about the regulator somewhere here on diyaudio).
After checking all connections and inserting the tubes I flipped the switch and happily saw the heaters of one board starting to generate the homely orange....

The other side...nada...nichts...nothing.
I checked all connections again and checked voltages, and I do have 6.15V on pin5 of all four tubes, measured on the soldering joint to the sockets.

Do I have a case of shxxxy sockets on one of my boards? Never had that happen but can't think of another cause...

Btw: I also tried some EL84 in that board, but no heaters coming on...
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Old 24th March 2008, 08:39 PM   #2
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Default Re: aikido heater

^^^^

Obvious thing first: did you miswire the heater connections on the sockets that have the dark VTs?
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Old 25th March 2008, 10:37 AM   #3
Stixx is offline Stixx  Germany
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Quote:
Obvious thing first: did you miswire the heater connections on the sockets
No, since the sockets can be soldered to the board only in one position and the + lead goes to + on the board.
Also I have 6.15V on all of pins 5...

Thanks Miles!
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Old 25th March 2008, 01:29 PM   #4
jrebman is offline jrebman  United States
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Did you solder the heater voltage selection jumpers in place? If they weren't inmstalled, it might explain your problem -- I said might :-).

-- Jim
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Old 25th March 2008, 04:15 PM   #5
Stixx is offline Stixx  Germany
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Yes I did...
both boards are populated exactly the same...I checked.

Will check the sockets of that board again.
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Old 26th March 2008, 02:11 AM   #6
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Check for continuity from the heater pins to PS maybe?

You don't need to do something with pin 9 on some of the tubes?


Fran
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Old 1st April 2008, 08:36 PM   #7
Stixx is offline Stixx  Germany
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My problem is continuing...

This is my fourth tube amp (all being headphone amps) and I hate to ask silly questions, but after trying a bunch of different things the tube heaters on one board are not working...

Just to rule out the most obvious things:

- heater wires are connected identically
- the psu (regulator) is grounded
- I have switched sides --> all tubes are good, heaters have continuity
- I do have 6.15V on all pins 5 on the boards
- boards are populated identically, jumpers are in
- my regulator has been tested with a load od 2.2 ohm = ~2.9A

This is driving me crazy...

To illustrate things two images of my breadborad attached...

Click the image to open in full size.

Click the image to open in full size.

Anybody has an idea what could keep the left side of working properly...??

Thank you!
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Old 1st April 2008, 08:50 PM   #8
Janez is offline Janez  Slovenia
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One board is upside down. If you do this you mess up pinouts for tubes.
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Old 1st April 2008, 09:50 PM   #9
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Do continuity check on the wire going to pin 4. You said you have 6v at pin 5. Is this measured to ground or from pin 5 to pin 4. I've seen where the conductor was broken inside the jacket. Maybe you have a bad solder joint on pin 4. Resolder everything at the filament power supply, you never can tell.
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Old 1st April 2008, 10:01 PM   #10
jrebman is offline jrebman  United States
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Another thing to check is whether the internal shield is shorted to ground (intentionally, or tied to ground via a .01 - .1 uF cap? Again, just another possibility with the 6cg7/6dj8 -- though don't know that the details of the 6h30 are.

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