RCA transistor house numbers - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 6th March 2006, 11:29 PM   #1
diyAudio Member
 
megajocke's Avatar
 
Join Date: Jan 2003
Default RCA transistor house numbers

I have found a couple of TO-3 power transistors made by RCA that I don't know the specs for. I was planning to build a car sub amplifier using a 2n5631 and a 2n6031 that I had in the parts bin but just found out that the 2n6031 has all its terminals shorted together.

In the parts bin there are a couple of telecom power supplies that convert 50V to +-10V or +-15V. They use two of RCA (SGS in some of them) N121230-3 NPNs driving a transformer in push-pull so they have to be at least 100V parts. I have at least 8 of these so I could parallell if needed.

I saw them mentioned in this thread:
Rca Mosfet?

One poster claims them to be 120V, 12A. Does anyone know max power dissipation or any other useful data?

I also have 2 of RCA N121122 NPN transistors, but they were used in another application, as a standard class B amplifier driven by a single 50V rail used to generate ringing voltage. I don't know how heavy load it was supposed to drive, but probably not too heavy as the emitter resistors are 1 ohm.


My power supply puts out +-40V unloaded with 14V input. I have not measured how much it sags under load as I have built it on a breadboard and I don't want stuff melting A quasi-complementary with 1 or 2 pairs of N121230-3 maybe?
  Reply With Quote
Old 7th March 2006, 08:21 AM   #2
djk is offline djk
diyAudio Member
 
djk's Avatar
 
Join Date: Feb 2001
Location: USA
Switching power supply transistors have no safe area when operated in a linear amplifier.

I have 600pcs of 2N6274, a 50A, 30Mhz, 100V, 250W part. They cost over $40 each 20+ years ago. At 7V they will handle the full 250W, at 100V the SOA is only 6W !!!

The MJ15015/16 pair have 180W SOA at 60V, and only cost about $1.50 each, used in Crown, Carver, and others.
  Reply With Quote
Old 7th March 2006, 10:07 PM   #3
diyAudio Member
 
megajocke's Avatar
 
Join Date: Jan 2003
Well, power transistors aren't that cheap here in Sweden I'm afraid Farnell is the only place I can find that stock them but their price is 60SEK (~$7) a piece. MJ15003's are easier to find, and they cost about 40SEK (~$5) in most places.

I found 2 pairs of 2SD718 and 2SB688 in the parts bin. Datasheets can be found on alldatasheet.com and they look suitable. I'll use both pairs in the amp. The speaker is 8 ohms so the amp shouldn't complain too much.

The circuit is going to be a mix between P3A and Douglas Self's Blameless amplifier.
  Reply With Quote
Old 7th March 2006, 10:56 PM   #4
djk is offline djk
diyAudio Member
 
djk's Avatar
 
Join Date: Feb 2001
Location: USA
$7?

Ouch! I paid $1.23 for the MJ15015s and $1.30 for the MJ15016s.

The 2SD718 and 2SB688 should be fine for what you want.
  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
Transistor Beta Numbers & Matching Q? Zero Cool Solid State 12 18th May 2006 03:41 PM
Totally Unfamiliar Transistor Numbers...??? EchoWars Solid State 9 26th September 2005 09:02 PM
transistor part numbers bjr Parts 2 4th September 2005 04:26 PM


New To Site? Need Help?

All times are GMT. The time now is 06:27 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