Hickok 752A calibration? - Page 5 - 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 7th January 2012, 10:57 PM   #41
mksj100 is offline mksj100  United States
diyAudio Member
 
Join Date: Oct 2007
Location: Tucson, AZ
Pretty stiff on the transformer rewind, but then it is a lot of work and time. Another option might be to use/fit a toroidal transformer that has dual independent secondaries. You would need to account for the primary side voltage which I assume it is 100V on this model. AnTek has a number of inexpensive dual voltage dual isolated secondary windings toroid transformers. Something like the AN1T200 ($29.00), would give ~203V unloaded at 120V, so ~170V at 100V input (both secondaries would be used independently as opposed to parallel) Antek - AN-1T200 . Toroid transformers would be a bit stiffer, so may not see as much sag under load, but you could always pad it on the primary side. Not sure how it would operate in the tube tester circuit, but I have done something similar on the filament transformer to allow testing of some high current tubes. It's been an informative discussion, will bow out at this point.
  Reply With Quote
Old 7th January 2012, 11:21 PM   #42
dgta is offline dgta  United States
diyAudio Member
 
Join Date: May 2011
Guys, looks like I can get an Antek transformer with TWO 170V secondaries pretty cheaply but need to be careful specifying it.

Can anyone tell me how much the plate voltage (150VDC) droops with an actual tube under test drawing current? For example, a 6L6 at whatever the test current is (20-30 mA?)

Edit: wow, I was just researching Antek while you were posting, how coincidental can we get?

Last edited by dgta; 7th January 2012 at 11:24 PM.
  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
EF86 on HICKOK 752a tester..?? gianis Tubes / Valves 1 27th December 2011 10:20 PM
Hickok tube tester calibration help needed tc4all Tubes / Valves 4 12th January 2009 02:48 AM
Hickok 752A repair farriswheel Tubes / Valves 2 22nd June 2008 10:44 PM
calibration of RAE0142 eledora Digital Source 0 24th August 2007 02:17 PM
AudioTester 2.2 Calibration Tyimo Multi-Way 0 29th March 2007 05:34 PM


New To Site? Need Help?

All times are GMT. The time now is 10:21 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