50watt Plexi Again - 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 19th March 2004, 11:46 PM   #1
edsmith is offline edsmith  Australia
diyAudio Member
 
Join Date: Mar 2004
Location: Australia
Default 50watt Plexi Again

Thanks alot guys. So a Hammond 1650k output transformer,
Would a 400-0-400 200mA 5v 3A, 6.3v 6A be the way to go?
Should I use a 9H 40mA choke or a 30H 40mA or a 15H 75mA?

I'm getting these products off this Australian site:
http://www.evatco.com.au/hamptprice.htm

Just wanna make sure I'm buying the right thing!

For those who did not read my previous post the amp I am going to build is found at www.drtube.com in the marshall section.

its the JMP Lead 50watt Plexi



Thanks so much
edsmith
  Reply With Quote
Old 21st March 2004, 09:46 PM   #2
stormy is offline stormy  United Kingdom
diyAudio Member
 
Join Date: Mar 2004
Location: Scotland
Default Re: 50watt Plexi Again

Quote:
Originally posted by edsmith
Thanks alot guys. So a Hammond 1650k output transformer,
Would a 400-0-400 200mA 5v 3A, 6.3v 6A be the way to go?
Should I use a 9H 40mA choke or a 30H 40mA or a 15H 75mA?

I'm getting these products off this Australian site:
http://www.evatco.com.au/hamptprice.htm

Just wanna make sure I'm buying the right thing!

For those who did not read my previous post the amp I am going to build is found at www.drtube.com in the marshall section.

its the JMP Lead 50watt Plexi



Thanks so much
edsmith

Hi,
I see that you did not take my advice on the rating for the choke.
If your a guitarist and building amps you must have seen the size of chokes on amps, have you ever seen a small one, I think not.
as mentioned earlier on last post by other member, even an ac50
has a 100mA fitted, And i have 2 1960's ac30's both with 100mA
chokes even the origonal schematic advises 100-200mA rated.

remember theres more of a surge on cold power up in the dc with solid state rectification than with a valve rectified supply which is what an ac30 has.

Regards stormy
  Reply With Quote
Old 23rd March 2004, 07:14 PM   #3
adamamp is offline adamamp  Canada
diyAudio Member
 
Join Date: Mar 2004
Location: East of Eden
Default Re: Re: 50watt Plexi Again

Quote:
Originally posted by stormy



Hi,
I see that you did not take my advice on the rating for the choke.
If your a guitarist and building amps you must have seen the size of chokes on amps, have you ever seen a small one, I think not.
as mentioned earlier on last post by other member, even an ac50
has a 100mA fitted, And i have 2 1960's ac30's both with 100mA
chokes even the origonal schematic advises 100-200mA rated.

remember theres more of a surge on cold power up in the dc with solid state rectification than with a valve rectified supply which is what an ac30 has.

Regards stormy
Combined total current may only be 50ma or so but 100ma rating for the filter choke would be a much better choice. Also true that the inrush current is greater with SS rectifier. Go with 100ma or greater. The amp is only as good as the sum of its parts and the price difference is negligable. Happy building, my first guitar amp clone was a Marshall Master 50 and my last was a point to point wired 5150(six stages of preamp bliss)
Good luck with noise,
keep your leads short and your patience long
  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
50watt into 1ohm load with KAPPA 9 tinitus Solid State 22 22nd November 2006 11:51 PM
tubes: Jcm 900 Slx 50watt Stongelo Tubes / Valves 1 9th December 2005 09:32 AM
50watt 8 inch driver question psychosteve Multi-Way 0 24th September 2004 12:02 PM
Extra gain stage Marshall plexi 50watt edsmith Tubes / Valves 1 22nd March 2004 04:58 PM
Plexi WCC_Burnout Multi-Way 7 24th February 2003 05:22 PM


New To Site? Need Help?

All times are GMT. The time now is 01:17 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