thr light in pcl82 - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 22nd April 2012, 07:09 AM   #1
death is offline death  Iran
diyAudio Member
Join Date: May 2011
Location: tehran
Default thr light in pcl82

hi there
recently i tried a pcl82 se amp. the problem is with the heater.
i supply the heater with 15 volts ac of a 2x7.5 V,3A transformer.the no load voltage of the trans is about 17volts ac. by my knowledge this tube's heater is a 300mA at 16 volts. it works but when i power on the tube, i see a yellow light shining from the junction of the heater in the tube. it shines for just a second .i want to know if this is bad for the tube.?
my tube is telefunken and is not used so i think maybe the power supply is not good for this kind of tube.or maybe its because of the tube !?
  Reply With Quote
Old 22nd April 2012, 09:49 AM   #2
diyAudio Member
Join Date: Aug 2010
Location: Near Eindhoven, the sanctum of the pentode. and among that other things.
Send a message via Skype™ to v4lve lover
dont worry its pretty common .
PCL82 are there in abundance if it breaks replace it .
maybye add an NTC ?

v4lve .
  Reply With Quote
Old 22nd April 2012, 10:07 AM   #3
diyAudio Member
Shoog's Avatar
Join Date: Aug 2002
Location: Eire
This type of power on surge is very common on old valves. There is no problem and the valve will give normal service.

  Reply With Quote
Old 27th April 2012, 07:41 PM   #4
death is offline death  Iran
diyAudio Member
Join Date: May 2011
Location: tehran
thank you all
so i think its safe to continue .
last night i was reading "pcc88" datasheet and it said that there is a need for current limitig resistor because of the starting current is high when the filament is cold. i think the ntc may works.
  Reply With Quote


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
k-502/k-12m vs. Model 1 pcl82 webelo Tubes / Valves 3 20th October 2007 04:33 AM
PCL82 SE Tube Amplifier Kit savakovacevic Tubes / Valves 4 28th January 2006 09:41 AM

New To Site? Need Help?

All times are GMT. The time now is 11:17 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2