EL84 Amp - Baby Huey - Page 133 - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 27th January 2013, 05:08 PM   #1321
surfstu is offline surfstu  United Kingdom
diyAudio Member
 
Join Date: Nov 2008
Location: London
Thanks Bas, maybe I will start looking out for a cheaper choke option....

GZ34, any other tube recitifiers that you could recommend that could handle the current demands of the babyhuey?
  Reply With Quote
Old 27th January 2013, 05:15 PM   #1322
diyAudio Moderator Emeritus
 
Bas Horneman's Avatar
 
Join Date: Apr 2002
Location: The Netherlands
Blog Entries: 18
Hi surfstu, I am using a 5R4. Basically anything that can handle 200mA.

Verstuurd van mijn GT-N7000 met Tapatalk
  Reply With Quote
Old 27th January 2013, 05:24 PM   #1323
surfstu is offline surfstu  United Kingdom
diyAudio Member
 
Join Date: Nov 2008
Location: London
Thanks Bas, if you have a schematic available for your psu with the 5r4 I would love to see it....

Stuart
  Reply With Quote
Old 27th January 2013, 07:11 PM   #1324
diyAudio Member
 
Soonerorlater's Avatar
 
Join Date: Jul 2008
Location: Belfast
Quote:
Originally Posted by surfstu View Post
will the choke make a noticeable difference? I'm planning on a similar supply for the early ecl86 baby huey design but the Lundahl chokes are near 150!

and why does no one use the GZ34 for rectification? I only ask because I already have the octal socket for it in my chassis....
Hi Surfstu,

I got mine from here


HT Smoothing Chokes

Also keep an eye on Ebay
__________________
When white moths were on the wing,
And moth-like stars were flickering out,
  Reply With Quote
Old 27th January 2013, 08:19 PM   #1325
surfstu is offline surfstu  United Kingdom
diyAudio Member
 
Join Date: Nov 2008
Location: London
Thanks Soonerorlater,

would I need a choke greater than 100mA? I presume so...

seen a nice vintage 17H 160mA that i could buy

would that be too little?

it will be running into 4 x ecl86 PP UL amp with approx 30mA running through each tube
  Reply With Quote
Old 27th January 2013, 10:11 PM   #1326
diyAudio Member
 
Soonerorlater's Avatar
 
Join Date: Jul 2008
Location: Belfast
Current wise you should just about be OK for 4 X ECL86's.

Quote:
seen a nice vintage 17H 160mA that i could buy
IIRC the choke spec was 5-10H. Perhaps you could model your power supply in Duncan to see how the increase in inductance changes things.


For me, vintage means "used". Of course if this vintage choke is dirt cheap.............
  Reply With Quote
Old 27th January 2013, 10:39 PM   #1327
surfstu is offline surfstu  United Kingdom
diyAudio Member
 
Join Date: Nov 2008
Location: London
Thanks, I,ve just started using PSUD2 as of yesterday...

was a little confusing for a noob but I,m getting there... I don't think the 17H should be a problem, just hope that 160mA is ok.

There is also a nice quad 2 choke on the same site for sale, kinda like the idea of that, just need to find some info on its rating...

Just using PSUD2 now to try and workout if I can use the spare heater filament supply (6.3V) and convert it to 12Vac or 12vdc, to power some chinese VU Meters tha i just bought. The driver board requires either ac or dc at 12v.

Stu
  Reply With Quote
Old 28th January 2013, 04:28 PM   #1328
M Gregg is offline M Gregg  United Kingdom
diyAudio Member
 
M Gregg's Avatar
 
Join Date: Jun 2010
Location: UK
Has anyone built,

the amp in post 1261/1262 of this thread?

And used off the shelf power Tx and good OP Tx?



Regards
M. Gregg
__________________
What is the sound of one hand clapping?
  Reply With Quote
Old 28th January 2013, 07:18 PM   #1329
diyAudio Member
 
Soonerorlater's Avatar
 
Join Date: Jul 2008
Location: Belfast
Quote:
Originally Posted by gingertube View Post
The rest of the Jessica Amp for info

Note this was a 6V6 + 6SL7 version.

Cheers,
Ian


Page 127
__________________
When white moths were on the wing,
And moth-like stars were flickering out,
  Reply With Quote
Old 1st February 2013, 02:00 AM   #1330
diyAudio Member
 
Drewaudio's Avatar
 
Join Date: Mar 2006
Location: New Zealand
Default Update for interested parties...

Hi all,

Just a quick update for those that are interested....

Well I finally finished the main amp today and fired it up with 6V6's (my plan is to use 6F6's). Wow!...this little amp sounds just amazing! It's way better than any amp I've previously built and it's dead silent with no signal (I measure 0.0001mv rms hum at the speaker). OPT's are custom electraprint's 20 watt 10k to 6 ohm.

I deviated from the PSU slightly. The negative supply uses a voltage doubler fed by the two 9v windings on a toridal to get -48v. This allowed me to wind a heater winding on the torid for the 6sl7's.

The only problems so far is that the 6v6 bias pots (50k) are fully wound and I can't drop the current below 42ma (they started off at about 100ma at very first power on!!!). The balance pots (100R) are also fully wound to one side and only just come close to balancing....

I'll take some more measurements over the next few days but the sound is just fantastic! Thanks Gingertube!
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Red Light District/Baby Huey (EL84 P-P) Output Iron dsavitsk Tubes / Valves 3 14th February 2009 02:21 AM


New To Site? Need Help?

All times are GMT. The time now is 06:36 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2