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The Red Light District - another PP EL84 amp
The Red Light District - another PP EL84 amp
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Old 19th July 2013, 11:11 PM   #881
SY is offline SY  United States
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The Red Light District - another PP EL84 amp
Those probably have built in current limiters. Not a good choice.

The HLMP6000s are ideal and pretty inexpensive.
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Old 20th July 2013, 10:10 AM   #882
Alastair E is offline Alastair E  Wales
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How about a constant voltage-sink with a MOSFET referenced to a zener, suitably decoupled, will give the advantage of trimming the bias current....

Just a madcap idea, I used this on an OTL to good effect...
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Old 21st July 2013, 11:20 AM   #883
SY is offline SY  United States
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The Red Light District - another PP EL84 amp
That will get you constant voltage, yes, the question is then, what happens after overload? The LEDs snap back nearly instantaneously. A MOSFET regulator bypassed with a cap? Perhaps not so instantaneously.

The screen regulator gives you idle current adjustment.
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Old 10th October 2013, 08:08 PM   #884
JZatopa is offline JZatopa  United States
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SY could you confirm I am using the right LEDs? I ordered some 630-hlmp-6000 but they are very small
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Old 4th December 2013, 05:44 PM   #885
roren is offline roren  Sweden
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Hi,
I want to ask you who have buildt this RLD amp. And live in a 230-240V country:
What transformer did you use for the 12AT7 driver HT? I have searched the net
but all that I have find is big and expensive transformer.
Every tip is welcome.

Regards.
Rolf
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Old 4th December 2013, 06:21 PM   #886
yagoolar is offline yagoolar  Poland
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Send a message via ICQ to yagoolar The Red Light District - another PP EL84 amp
Default The Red Light District - another PP EL84 amp

I have built it. You may check here
http://www.indel.pl/sp_prod.htm or here http://www.indel.pl/e_tsl.htm
For mains xformer go to "transformatory sieciowe do wzmacniaczy lampowych" TSL (plural). For output - " transformatory głośnikowe"
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Old 4th December 2013, 06:23 PM   #887
stajo is offline stajo  Sweden
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The Red Light District - another PP EL84 amp
Quote:
Originally Posted by roren View Post
Hi,
I want to ask you who have buildt this RLD amp. And live in a 230-240V country:
What transformer did you use for the 12AT7 driver HT? I have searched the net
but all that I have find is big and expensive transformer.
Every tip is welcome.

Regards.
Rolf
I once asked Sverbry to wind one on an EI-60 but they wouldnt deal with 0.1 mm thread on secondary. Primary 230 is 0,15 on EI-60 i beleave.

You could volt-double or ask them for an EI-78 (30 VA) easy giving over 300 VAC. Not expensive.

Last edited by stajo; 4th December 2013 at 06:35 PM.
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Old 4th December 2013, 07:03 PM   #888
stajo is offline stajo  Sweden
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The Red Light District - another PP EL84 amp
Svebry, sorry I misspelled
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Old 5th December 2013, 03:20 AM   #889
roren is offline roren  Sweden
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yagoolar and stajo,
Thank you guys! Both tips is new to me. So I will check them out.

Thanks again.
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Old 5th December 2013, 05:23 AM   #890
stajo is offline stajo  Sweden
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The Red Light District - another PP EL84 amp
If you go for Svebry we could ask them to wind up a few, I would be interested to. They are nice to deal with and gives good prices on series. It would be this one EI-78 Trafobyggsats - Svebry Electronics AB which I guess will have 0.20 on primary 230. Ask them to put a full bobin of 0.15 on the secondary. Their mashine fixes that. They can predict the secondary voltage on that.
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