Newbie - 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 1st April 2015, 08:09 PM   #1
diyAudio Member
 
Join Date: Apr 2015
Location: Yorkshire
Default Newbie

Hi all.

New to this site so please be patient if I get some terminology wrong.

Having caught the HiFi bug way back in the early eighties watching my old man repair, build, collect and play some serious gear, I have now turned into the bloke who (try's to repair) collect and revive older units. one thing I did learn was how to check resistance and how to solder quiet neatly!!

Having said the above I am no expert and require the help from the guys in the know. I have been given a Denon 2400 power amp, none working. I have found a few fuses, resistors and transistors blown. I have replace all the resistors, fuses like for like, check all the others - good so far, but some of the transistors are a pain to source.

the transistors are 2SC2458 BL BL, and a few ending with GR BK, I can find loads of resistors "2SC2458 GR 4J" will these do?

All I can find in difference is a lower noise level with the BLBL

Also a few Diodes that are 1SS270A, high speed switching, could any one recommend a alternative,

Thank you.

Last edited by rob1976; 1st April 2015 at 08:23 PM. Reason: Wrong part No
  Reply With Quote
Old 2nd April 2015, 07:52 AM   #2
diyAudio Member
 
Join Date: Apr 2010
Location: Coffs Harbour
Quote:
Originally Posted by rob1976 View Post
.... some of the transistors are a pain to source. the transistors are 2SC2458 BL BL, and a few ending with GR BK, I can find loads of resistors "2SC2458 GR 4J" will these do?.....Also a few Diodes that are 1SS270A, high speed switching, could any one recommend a alternative....
Hi and welcome to the forum.
The part number's suffix GR specifies the Hfe or gain category of the transistor. In this case it is 350-700 and it is often critical to meet this spec. so it's wise to ensure you have it. The second suffix figures BK,4J etc. are just batch or related manufacturing identifiers.
HTTP 301 This page has been moved


For audio, 1SS270A diodes are close enough to a standard 1N4148 diode and in most amplifier locations, I wouldn't hesitate to substitute rather than try to source a 2 cent Hitachi part for originality's sake.

Here is a service manual source which some might like to study and use rather than just prod about, flying blind. Denon POA-2400 Manual - Stereo Power Amplifier - HiFi Engine
http://www.nxp.com/documents/data_sh...148_1N4448.pdf
HTTP 301 This page has been moved
__________________
Ian
  Reply With Quote
Old 5th April 2015, 08:13 PM   #3
diyAudio Member
 
Join Date: Apr 2015
Location: Yorkshire
Thank you for the info. Correct parts ordered now I understand the codes.
  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
[NEWBIE]Amplifier Design[NEWBIE] KernelPanic Solid State 13 7th December 2011 02:32 AM
Newbie Lesco Introductions 1 1st June 2009 02:32 PM
newbie Q memphissound Multi-Way 7 17th August 2006 11:36 AM
Yet another newbie...... UK Dave Introductions 3 16th April 2003 01:45 PM
newbie post, but hopefully not a newbie question wiredcur Solid State 3 24th August 2002 10:49 PM


New To Site? Need Help?

All times are GMT. The time now is 08:58 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright 1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2