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EL84 Amp - Baby Huey
EL84 Amp - Baby Huey
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Old 8th December 2011, 03:09 PM   #1161
Brouilly is offline Brouilly  United Kingdom
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Thanks for the advice, I will do that.

I did just swap the el84s around and blew the power supply resistor, so I am sure now that my problem before was a faulty valve.

Cheers
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Old 8th December 2011, 03:13 PM   #1162
Bas Horneman is offline Bas Horneman  Netherlands
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If this was my amp I would like to know that all is well apart from the ECC803s ccs and the RLD bias scheme for the EL84's. I had similar problems with the ccs's in the basic BH version. I simplifyed the amp by replacing the preamp ccs with a 675R resistor ( IIRC ) and biased the EL84's separately with 270R resistors. Happily this gave me a working amp with all the proper voltage values. I then reintroduced the ccs's one by one solving any local faults as I went along.
Excellent advice.
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Old 8th December 2011, 04:42 PM   #1163
Brouilly is offline Brouilly  United Kingdom
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Agreed, thanks Bill.

It's great to come on this website and get some clarity when your mind is turning to mush.

Charlie
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Old 8th December 2011, 05:43 PM   #1164
Soonerorlater is offline Soonerorlater  United Kingdom
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EL84 Amp - Baby Huey
Aw shucks...........
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Old 9th December 2011, 12:08 PM   #1165
Brouilly is offline Brouilly  United Kingdom
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Originally Posted by Bas Horneman View Post
And did you check and double check the pinout?

1 and 8 (cathodes) to CCS

3 and 6 (anodes)

2 and 7 (grids)
With a fresh head and a new set of eyes I found my first wiring problem.

I don't know why I didnt check myself, because it did seem a different pinout to a normal ECC83.

JJ ECC803S / 12AX7

Should be 1 and 6 cathodes

3 and 8 anodes.

Pretty sure the ECC803s' ive been using will be damaged now, but they are easliy replaceable. I hope there is no other damage done.

At least we have progress!

Charlie
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Old 9th December 2011, 12:30 PM   #1166
GloBug is offline GloBug  Canada
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Right on.
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Old 9th December 2011, 01:09 PM   #1167
Bas Horneman is offline Bas Horneman  Netherlands
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Should be 1 and 6 cathodes

3 and 8 anodes
I'll change the pinout on the schematic in the WIKI ASAP! Thanks for catching that.

[edit] Wait a minute. It should be 1 and 6 anodes. And 3 and 8 cathodes.
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Old 9th December 2011, 01:14 PM   #1168
Bas Horneman is offline Bas Horneman  Netherlands
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Pretty sure the ECC803s' ive been using will be damaged now
Nah they are tubes. Not transistors.
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Old 9th December 2011, 01:23 PM   #1169
Brouilly is offline Brouilly  United Kingdom
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Quote:
Originally Posted by Bas Horneman View Post
I'll change the pinout on the schematic in the WIKI ASAP! Thanks for catching that.

[edit] Wait a minute. It should be 1 and 6 anodes. And 3 and 8 cathodes.
Yes, sorry that's what I meant. Useless!
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Old 9th December 2011, 01:44 PM   #1170
Soonerorlater is offline Soonerorlater  United Kingdom
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Quote:
Should be 1 and 6 cathodes

3 and 8 anodes.
1 and 6 anodes, 3 and 8 cathodes perhaps, .......


12AX7 and ecc803s and ecc83 all have the same pin-out.


In the wiki schematic it looks like top triode (a) has reversed cathode and anode pin numbers.

Quote:
It should be 1 and 6 anodes. And 3 and 8 cathodes.

Sorry Bas, just spotted your edit......

Last edited by Soonerorlater; 9th December 2011 at 01:55 PM. Reason: clarity
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