The MingDa MC67-HA meets Frankenstein - 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 26th August 2008, 06:53 PM   #1
Rodango is offline Rodango  United States
diyAudio Member
 
Rodango's Avatar
 
Join Date: Jul 2007
Location: Salem, OR
Send a message via AIM to Rodango Send a message via Yahoo to Rodango
Default The MingDa MC67-HA meets Frankenstein

My favorite preamp in my collection is my MingDa MC67-HA. I have never heard a better preamp... ever...

But it smoked... So now I get to hack it!

The power transformer and chokes burned up because the startup autosequencing relay shorted. I was thinking of getting a new model but as far as I can tell, this it the mother of MingDa preamps.

I put on a Hammond transformer and choke. Also the amp uses four 6N6 9-pin Chinese triodes in the power supply, two are rectifiers and the other two are in the voltage regulator. Seeing as how the relay is all wrapped up in the two rectifier tubes, I cut the relay out of the circuit and will be using 6CA4 rectifiers which I think should be pin-compatible with what's there.

I'll post pictures and progress as I go...
  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
Frankenstein becomes cindarella..I hope! terry j Multi-Way 118 28th January 2012 11:59 AM
another mingda carcass Tubes / Valves 3 9th March 2007 12:42 AM
Frankenstein ppereira Tubes / Valves 20 17th December 2006 07:48 PM
Frankenstein tube amp karma Tubes / Valves 6 4th July 2004 03:20 AM


New To Site? Need Help?

All times are GMT. The time now is 02:47 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