Troubleshooting help for a neophyte - 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 16th December 2010, 04:29 AM   #1
firekat is offline firekat  United States
diyAudio Member
 
Join Date: Jun 2004
Location: Oakland, CA
Default Troubleshooting help for a neophyte

I have Gabe's Mag 1515 PP kit amp which is no longer supported.

One day it just blew the fuse immediately on start up. I did contact Gabe and he said that it sounded like a bad cap and that I should replace the electrolytic caps.

I finally have gotten some time to get the parts and try to fix this thing. Tried what he said. Didn't work. Tried another rectifier for the heaters - no change. There are two diodes in the high voltage supply section, I slapped the DVM on them and the readings are not making any sense. I will probably have to disconnect them to test them properly, so I might as well replace them since they are pretty cheap.

The one thing I did do is I put the DVM on some of the windings of the Power Transformer, the input side showed resistance as did the high voltage section. The heater supply (6.3 volt windings) showed nearly zero ohms. Is this indicating a short? Is this Power Transformer bad? It is a Hammond 273BX. How would I confirm that the Power Transformer is bad? When i changed out the cap on the heater section I noticed that the end was slightly bulged and the plastic disc on the end fell off.

I am pretty much of a neophyte with electronics. I have done a lot of fabrication in the past but I am not up on my electronics knowledge.

Any assistance would be greatly appreciated.

Last edited by firekat; 16th December 2010 at 04:33 AM.
  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
Questions from a neophyte dummy. slacky Full Range 3 17th December 2007 10:35 PM
neophyte - transformer potting ofb Tubes / Valves 13 13th December 2004 09:03 AM
Neophyte Introduction Tone Loc Introductions 1 14th January 2003 08:28 AM
Some xover questions from neophyte plasmodium Multi-Way 2 19th November 2002 01:11 PM


New To Site? Need Help?

All times are GMT. The time now is 11:57 PM.


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