Vintage Transistors - Page 7 - diyAudio
Go Back   Home > Forums > Design & Build > Parts
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

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 28th September 2012, 02:29 PM   #61
diyAudio Member
tiefbassuebertr's Avatar
Join Date: Jul 2005
Location: D-55629 Schwarzerden
Originally Posted by zakman35 View Post
I have recently found 5 x NEC 2sb248 transistors, new unused, but i cant find any datasheet about them.

Do you have any idea if they worth the trouble to build an amp with them?
Can you point me any suitable circuit?

Thanks in advance
ask there:
2SB248 -

or there:
  Reply With Quote
Old 28th September 2012, 11:49 PM   #62
GopherT is offline GopherT  United States
diyAudio Member
Join Date: Dec 2011
Parameters are listed here. Not exactly a DATASHEET but enough to get started.
2SB248 Datasheet. 2SB248 Equivalent, PDF Data Sheets - Parameters and Characteristics. Electronic Component Catalog.
  Reply With Quote
Old 30th September 2012, 06:24 PM   #63
Account disabled at member's request
Join Date: Mar 2009
Location: Athens
Thank you both.
Do you think they worth the trouble to build and amp based on them?
  Reply With Quote
Old 30th September 2012, 06:36 PM   #64
GopherT is offline GopherT  United States
diyAudio Member
Join Date: Dec 2011
The old PNP germaniums a were used as Class A amplifiers in the late 1950s transistor AM radios in automobiles. Not because the were great or because Class A was great but, instead, because it was cheap, and a lot easier and more reliable than the tube amps they replaced (imagine how long a filament in a tube would last in an old-time car with bad roads and low-tech suspension and plenty of engine vibration.

They are not going to sound amazing, but they might make a unique sound for a low wattage guitar amp. I would at least set up a breadboard to see how it sounds - or if it even works after all these years.
  Reply With Quote
Old 2nd October 2012, 11:22 AM   #65
Account disabled at member's request
Join Date: Mar 2009
Location: Athens
Thanks Gopher, i would follow your advise to see how the sound.
  Reply With Quote
Old 19th November 2012, 05:21 PM   #66
diyAudio Member
destroyer X's Avatar
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default Young guys may think old things had crappy sound

Not real.... we had beautifull sound in the a days we have a lot of bad sound devices around.... so much or more than we had in the past.

Human ears are the same.... 50 years ago or music also the folks knows what is a good sound...maybe young folks have never listened to a live orchestra...some of them do not know what is this.

Listen a recording made with a cheap digital camera.... a Germanium amplifier playing from 1968....old thing, old capacitors (young guys goes replacing all them and fast) and with wonderfull sound.

how audio (could have) sounded on 14 may 1968 - YouTube


Full throotle amplifier manufacturing;, Sample Dx Classic
  Reply With Quote
Old 26th July 2015, 08:22 AM   #67
diyAudio Member
Join Date: Feb 2008
Location: Jackson,michigan
Any have any info on the very old Honeywell power transistors Circa about 1957?
I have a friend that has about 30 or so of the H5 types.
The number he gave me is H5B5D2.

He was thinking about building an amplifier with these and I suggest a classic transformer driven Class AB/B or something may be the easiest design to do.
He was thinking about using four of them per amplifier.

Any info at all would be Great!!

Cheers !!

  Reply With Quote
Old 26th July 2015, 08:28 AM   #68
diyAudio Member
JonSnell Electronic's Avatar
Join Date: Dec 2012
Location: The Jurassic Coast, England. GB
When I was an Aprentice Test Engineer in 1967at Weymouth Radio (Weyrads), I was told by the Chief Engineer that Germanium Transistors had a shelf/useful life of 25years. Silicon had no such shelf life.
What happens is the Germanium gradually gets leakier and leakier until the gain or Hfe returns to 1.
Support for Fender, Marshall and all Valve Equipment; Audio Innovations, Audiorama FU29, Quad and Leak.

Last edited by JonSnell Electronic; 26th July 2015 at 08:37 AM. Reason: Spelling
  Reply With Quote
Old 26th July 2015, 08:48 AM   #69
diyAudio Member
Join Date: Feb 2008
Location: Jackson,michigan
Hmmmmm....Very interesting I will tell my friends this.

I asked him to check the hfe if he could and he will get back with me later on this.

I told him to expect a rather low hfe from what little data I could find if it even pertain's to this family of devices.

  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
Transistors for 80's vintage amps archangele Solid State 10 31st October 2013 12:43 AM
Vintage Transistors Captn Dave Swap Meet 1 29th May 2010 04:32 PM
vintage sansui transistors honsten Solid State 4 29th May 2010 01:59 PM
Looking For Output Transistors For Vintage Car Radio 65blkbkgt Car Audio 14 29th May 2010 01:58 PM
Vintage Transistors antiquekid3 Solid State 12 29th May 2010 01:54 PM

New To Site? Need Help?

All times are GMT. The time now is 10:45 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