EL84 Amp - Baby Huey - Page 22

LowRedMoon · 9th November 2006, 11:35 PM

Thanks, Ian.

What has been your verdict on the bypass cap configuration?

gingertube · 10th November 2006, 01:29 AM

Adam,
See earlier post. I'm using a single 1000uF/25V Blackgate NX across each EL84 Cathode current source. This is the best I've been able to come up with.
Cheers,
Ian

planet10 · 10th November 2006, 06:33 AM

Quote:

Originally posted by LowRedMoon
As preamps go, I think the Bottlehead (Extended) Foreplay would be a good bet for around $400, but I don't like the fact that I'm not forced to learn things in order to build it - the amp is already planned and laid out. That idea really turns me off. I've always been one for steep learning curves and the associated satisfaction that follows earned success. Yeah. I have problems.

Have a look at the 12B4 preamp threads.

dave

LowRedMoon · 11th November 2006, 02:55 PM

I've been sourcing power transformers for mono versions of this amp.
Here's what I've found to be adequate. Please tell me if there are any known disadvantages to using smaller transformers instead of one large one.

Plate and heaters:

Hammond 261G6 250V CT @ 130ma, 6.3V @ 2A

CCS 5V:

Hammond 167M5 5V CT @ 3A (higher current ratings available) ...and I honestly don't know what to do with the centre tap.

LowRedMoon · 11th November 2006, 03:04 PM

Quote:

Originally posted by planet10

Have a look at the 12B4 preamp threads.

dave

Thanks, Dave. I'll check it out. Would it be this thread you are refering to?
Yet another 12B4 line stage...

planet10 · 12th November 2006, 05:32 AM

That is one of them... it will have the info you need.

dave

Luke · 7th December 2006, 07:03 AM

hi Gingertube,

I have made a world audio kit kel34 and it sucked. Anyway, Ive never heard another valve amp so I want to build good one to decide if I like valve amps or not.
Thing is I cant find any where in NZ or Aussie where I can find good quality transformers. Do you have any suggestions where I can find good transformers?

EC8010 · 7th December 2006, 08:38 AM

Quote:

Originally posted by Luke
I have made a world audio kit kel34 and it sucked.

I've never seen one in the flesh, but that's odd since it's a derivative of the classic Mullard 5-20. Are you certain everything is correct? Are the DC voltages as specified?

Luke · 7th December 2006, 08:50 AM

yes everything was correct, it really was mediocre.

EC8010 · 7th December 2006, 09:00 AM

That's a shame. Treat it as a test bed for other circuits?

12th November 2006, 05:32 AM	#216
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 5	That is one of them... it will have the info you need. dave __________________ community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

7th December 2006, 09:00 AM	#220
EC8010 diyAudio Moderator Emeritus Join Date: Jan 2003 Location: Near London. UK	That's a shame. Treat it as a test bed for other circuits? __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

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9th November 2006, 11:35 PM	#211
LowRedMoon diyAudio Member Join Date: Jan 2006 Location: Upstate New York	Thanks, Ian. What has been your verdict on the bypass cap configuration?

10th November 2006, 01:29 AM	#212
gingertube diyAudio Member Join Date: Oct 2004 Location: Adelaide South Oz	Adam, See earlier post. I'm using a single 1000uF/25V Blackgate NX across each EL84 Cathode current source. This is the best I've been able to come up with. Cheers, Ian

11th November 2006, 02:55 PM	#214
LowRedMoon diyAudio Member Join Date: Jan 2006 Location: Upstate New York	I've been sourcing power transformers for mono versions of this amp. Here's what I've found to be adequate. Please tell me if there are any known disadvantages to using smaller transformers instead of one large one. Plate and heaters: Hammond 261G6 250V CT @ 130ma, 6.3V @ 2A CCS 5V: Hammond 167M5 5V CT @ 3A (higher current ratings available) ...and I honestly don't know what to do with the centre tap.

7th December 2006, 07:03 AM	#217
Luke diyAudio Member Join Date: Sep 2001 Location: Wellington NZ	hi Gingertube, I have made a world audio kit kel34 and it sucked. Anyway, Ive never heard another valve amp so I want to build good one to decide if I like valve amps or not. Thing is I cant find any where in NZ or Aussie where I can find good quality transformers. Do you have any suggestions where I can find good transformers?

7th December 2006, 08:50 AM	#219
Luke diyAudio Member Join Date: Sep 2001 Location: Wellington NZ	yes everything was correct, it really was mediocre.