Any ideas on this one??? - 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 2nd February 2011, 03:23 AM   #1
Dagwood is offline Dagwood  New Zealand
diyAudio Member
 
Dagwood's Avatar
 
Join Date: Feb 2010
Location: North of Auckland
Default Any ideas on this one???

Hi all,

I've searched the web for over an hour and cannot find any details on this valve

Print reads,

STC
290
4013
AUG - 60

Any ideas???

Thanks

STC, 1.JPG

STC, 2.JPG
__________________
If you keep digging in the garden of failure you will eventually find success
  Reply With Quote
Old 2nd February 2011, 03:31 AM   #2
diyAudio Member
 
HollowState's Avatar
 
Join Date: Aug 2006
Location: Taxland, New Jersey
It isn't a tube. It's a crystal and it looks like it might be bad. the connection looks broken off. Maybe just the picture?
__________________
"It is hard to imagine a more stupid or more dangerous way of making decisions than by putting those decisions in the hands of people who pay no price for being wrong." ~Thomas Sowell
  Reply With Quote
Old 2nd February 2011, 03:38 AM   #3
Dagwood is offline Dagwood  New Zealand
diyAudio Member
 
Dagwood's Avatar
 
Join Date: Feb 2010
Location: North of Auckland
Default Any ideas on this one???

Thanks for that any more info ???

Seems tobe intact to me, have attached another pic




Thanks
Attached Images
File Type: jpg STC, 3.JPG (602.2 KB, 114 views)
__________________
If you keep digging in the garden of failure you will eventually find success
  Reply With Quote
Old 2nd February 2011, 03:44 AM   #4
diyAudio Member
 
HollowState's Avatar
 
Join Date: Aug 2006
Location: Taxland, New Jersey
Ok, now it looks better. Probably quartz. No telling what the frequency is by those numbers though. By the thickness of it I'd guess it was fairly low. Maybe 100K or so. (?) You'd have to hook it up with something like a one transistor Pierce oscillator and measure the frequency.
__________________
"It is hard to imagine a more stupid or more dangerous way of making decisions than by putting those decisions in the hands of people who pay no price for being wrong." ~Thomas Sowell

Last edited by HollowState; 2nd February 2011 at 03:49 AM.
  Reply With Quote
Old 2nd February 2011, 03:59 AM   #5
Dagwood is offline Dagwood  New Zealand
diyAudio Member
 
Dagwood's Avatar
 
Join Date: Feb 2010
Location: North of Auckland
Thanks Hollowstate

Will put that one away for a rainy day.

Thanks again.
__________________
If you keep digging in the garden of failure you will eventually find success
  Reply With Quote
Old 2nd February 2011, 04:14 AM   #6
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
Most probably it is not quartz, it is a salt crystal resonator, that's why it is in sealed envelope. But may be it is a quartz. 290 KHz?
__________________
The Devil is not so terrible as his math model is!
  Reply With Quote
Old 2nd February 2011, 04:35 AM   #7
diyAudio Member
 
Join Date: Nov 2007
And you have to ask yourself how did the guy get his hand in there to write the "699" on the mica?

Gary
  Reply With Quote
Old 2nd February 2011, 06:07 PM   #8
tomchr is offline tomchr  United States
diyAudio Member
 
tomchr's Avatar
 
Join Date: Feb 2009
Location: Greater Seattle Area
One thing I've come to appreciate about tubes is that you can tell the pinout by looking through the glass at the internal connections...

I'd run an impedance sweep. Ground one side of the XTAL and hook up the other side through a resistor (10 kOhm would be my starting point) to a function generator. Then measure the voltage across the XTAL as you sweep the frequency. You should hit minimum voltage at the series resonance and maximum voltage at the parallel resonance.

~Tom
  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
Looking for ideas coldcathode Tubes / Valves 12 12th August 2009 02:08 PM
Need Ideas Arc Multi-Way 0 10th March 2007 01:45 AM
Just some ideas.. Ultima Thule Solid State 0 3rd October 2005 11:41 PM
2 New ideas, what do you think? lumanauw Solid State 4 6th April 2005 09:04 AM
Ideas please... kspv Digital Source 1 3rd July 2004 07:07 AM


New To Site? Need Help?

All times are GMT. The time now is 01:26 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