Where can I find choke and cap for Dynaco MKIII? - 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 6th July 2003, 06:26 PM   #1
Duo is offline Duo  Canada
diyAudio Member
 
Duo's Avatar
 
Join Date: Jun 2002
Location: Victoria, BC, Canada
Send a message via ICQ to Duo
Default Where can I find choke and cap for Dynaco MKIII?

I have a Dynaco MKIII amplifier that is in fairly good condition. There are problems though, it has no psu cap, a bad psu choke, and only one OT tube. Does anybody have some ideas where I can get a new cap, choke, and pair of tubes for moderately cheap? I'm willing to pay some decent money if I can find some nice tubes. I really like the old genalex KT88's.

Any ideas on good substitute tubes instead? Otherwise, everything is there and in good condition, I have cleaned and re-wired the amplifier completely so everything is ready to go with these new parts.

Any help greatly appreciated!


-- Duo
__________________
-- Duo, W1ngs, VA7MON, and lesser known handles. --
-- http://www.w1ngselectronics.com -- My Work and Projects --
  Reply With Quote
Old 7th July 2003, 01:25 AM   #2
diyAudio Member
 
Join Date: Jul 2003
Location: Ann Arbor, MI
Hi,
there aren't any suitable caps that wil fit in the can. The original is not quite suitable either, as the rectifier usually conducts first and the B+ goes through the roof.
Triode Electronics sells a circuit board cap substitute. It puts 400 volt capable caps in series for 800 volt rating, which will do OK even for SS diodes, but the screen rating of th power tubes is probably higher than should be run.
Keep the 5AR4, put in the SDS cap board and look at their power tub selection. KT88 or 6550 should do you fine.
They sell replacement chokes too.
regards,
Douglas
__________________
the Tnuctipun will return
  Reply With Quote
Old 7th July 2003, 03:14 AM   #3
DSummer is offline DSummer  United States
diyAudio Member
 
Join Date: May 2003
Location: Chicago, IL
Do you only have 1 pc of Dynaco MKIII (mono)? Forget the genelex KT-88 (too expensive) If you only need a pair of 6550/KT88, may be I can help. I also have some NOS Twist lok caps. Just send you an email, if interested, LMK.
__________________
DSummer
  Reply With Quote
Old 7th July 2003, 04:02 AM   #4
Duo is offline Duo  Canada
diyAudio Member
 
Duo's Avatar
 
Join Date: Jun 2002
Location: Victoria, BC, Canada
Send a message via ICQ to Duo
Well, I know the genalex tubes are quite expensive. However, I'm willing to pay for them if I can find a matched pair in good condition.
__________________
-- Duo, W1ngs, VA7MON, and lesser known handles. --
-- http://www.w1ngselectronics.com -- My Work and Projects --
  Reply With Quote
Old 7th July 2003, 04:42 AM   #5
Colt45 is offline Colt45  Serbia
diyAudio Member
 
Join Date: Feb 2002
Location: Canada
Send a message via ICQ to Colt45
whats the value of the stock cap?
  Reply With Quote
Old 7th July 2003, 05:16 AM   #6
DSummer is offline DSummer  United States
diyAudio Member
 
Join Date: May 2003
Location: Chicago, IL
Default stock cap value

Original cap is rated at 525V (30 + 20 + 20 + 20uF) B+ is 480V, so at least 500V rating is needed. 2 sets of 20uF are for driver and input stages, 450V rating is good enough.
__________________
DSummer
  Reply With Quote
Old 7th July 2003, 06:39 AM   #7
SHiFTY is offline SHiFTY  New Zealand
diyAudio Member
 
SHiFTY's Avatar
 
Join Date: Jul 2002
Location: New Zealand
Try www.angela.com they have some pretty sweet caps...
  Reply With Quote
Old 7th July 2003, 08:35 AM   #8
diyAudio Member
 
Join Date: Mar 2002
Location: Gothenburg, Sweden
Send a message via ICQ to Erik Johansson
This guy here in Sweden is selling a replacement quad-cap for the Dynaco Mk III. I donīt know if he ships abroad though, by you could always send him an email and ask for more info.

http://www.svalander.se/shoppen/mk3lyt.htm

The cap is custom made for him by Rifa. He sold these caps 10 years ago so he knows that this replacement work very well in the Mk III since owners still use those caps sold then with great results (a translation of some of the text).

Click the image to open in full size.

/Erik
  Reply With Quote
Old 7th July 2003, 10:27 PM   #9
Joel is offline Joel  United States
diyAudio Member
 
Joel's Avatar
 
Join Date: Oct 2002
Location: Brooklyn, NY
Didn't Bruce have a mod to replace those caps?
  Reply With Quote
Old 8th July 2003, 06:13 PM   #10
Duo is offline Duo  Canada
diyAudio Member
 
Duo's Avatar
 
Join Date: Jun 2002
Location: Victoria, BC, Canada
Send a message via ICQ to Duo
Nice looking cap. How hard would it be to mount that into the dynaco case? I don't want to have to do any modding of the chassis really because I have no tools for that. Anyway, I'm willing to try almost anything that works well, sounds good, and looks fairly close to original...

Keep those suggestions coming though!
__________________
-- Duo, W1ngs, VA7MON, and lesser known handles. --
-- http://www.w1ngselectronics.com -- My Work and Projects --
  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
Dynaco mkIII A431 op's dan _s Tubes / Valves 34 26th February 2008 01:53 PM
Not a typical MKIII Dynaco. Duo Tubes / Valves 10 22nd January 2007 12:25 AM
Dynaco MKIII: new power cord tubes rule Tubes / Valves 1 22nd November 2004 10:05 AM
Best Dynaco MKIII driver circuit for hobbiest build? jjasniew Tubes / Valves 15 31st December 2003 08:34 PM


New To Site? Need Help?

All times are GMT. The time now is 02:54 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright Đ1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2