QUAD 303 transistors - 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 29th August 2004, 05:26 AM   #1
TonyF is offline TonyF  New Zealand
diyAudio Member
 
Join Date: Jul 2003
Location: Wellington NZ
Default QUAD 303 transistors

My QUAD 303 amp has lost a transistor - Tr105 PNP driver
38496 (=BC143,2N4037). What is a modern substitute ? One Web page suggests BC461. Any other ideas ?
Cheers Tony
  Reply With Quote
Old 31st August 2004, 08:47 PM   #2
R.I.P.
 
Graham Maynard's Avatar
 
Join Date: Dec 2003
Location: UK
Hi Tony,

Have you tried e-mailing Quad, they are well known for their excellent after sales back-up.

From experience I would be very wary about subbing a transistor in a Quad amp if you want it to sound the same as they intended.
I'm sure they'll send you the correct part via a credit card order, even if you are not in the trade.

Is that driver the only faulty part though ?

Cheers ........ Graham.
  Reply With Quote
Old 31st August 2004, 09:28 PM   #3
paddy is offline paddy  Ireland
diyAudio Member
 
Join Date: Jul 2004
Location: cork / roscommon
Default quad

Quad support is worldclass you'll have the parts immediately if you just ask
  Reply With Quote
Old 31st August 2004, 09:39 PM   #4
TonyF is offline TonyF  New Zealand
diyAudio Member
 
Join Date: Jul 2003
Location: Wellington NZ
Default QUAD 303 transistors

Thanks Graham and Paddy. Got an automated reply from QUAD saying that the Service Manager was on holiday for 2 weeks ......

But I have now located a source of BC143, but indeed this may not be the only fault.
Cheers Tony
  Reply With Quote
Old 31st August 2004, 11:22 PM   #5
paddy is offline paddy  Ireland
diyAudio Member
 
Join Date: Jul 2004
Location: cork / roscommon
What are the chances! I've had no problems in the past. If you call them they can probably refer you to someone internally.

My towers transistor selector is 150 miles away at the moment so I can't help you with a replacement, if you are replaceing tr105 I would look at replacing tr106 also with a compliment to your chosen transistor .. if your other channel is still ok it should be easy to check the suitability of the replacement.

Please do look at this site though it seems they might know what they're talking about -

http://www.geocities.com/ResearchTri...dequitran.html

Both the BC441 and BC461 are available from

www.farnell.com (click the aussie flag edit:sorry kiwi flag)

Best of luck,

Paddy
  Reply With Quote
Old 8th September 2004, 11:47 AM   #6
TonyF is offline TonyF  New Zealand
diyAudio Member
 
Join Date: Jul 2003
Location: Wellington NZ
Default Quad 303 transistors

I finally have a reply from the Service Manager who had been on leave . He gave me the price for a replacement, with some comments about credit card usage. I replied saying I had been seeking info about a current replacement.
He has now replied saying that all they do is supply.
I rather think service standards have slipped ....
Cheers Tony
  Reply With Quote
Old 8th September 2004, 12:13 PM   #7
paddy is offline paddy  Ireland
diyAudio Member
 
Join Date: Jul 2004
Location: cork / roscommon
Default oh dear

That's a pity, they were so helpful in the past. The again he is a manager, most managers I've worked under didn't know their **** from their elbow when it came to things technical.

How much are they charging? Are they supplying the original transistor or an equivalent?

Good Luck,

Paddy
  Reply With Quote
Old 8th September 2004, 12:23 PM   #8
TonyF is offline TonyF  New Zealand
diyAudio Member
 
Join Date: Jul 2003
Location: Wellington NZ
Hello Paddy. How about 1.14 GBP +VAT + postage !!!!
I am really surprised that a request for info on a modern replace would yield such a response. I have asked him to say what the transistor is/

I may not get a reply ..
Cheers Tony
  Reply With Quote
Old 8th September 2004, 12:39 PM   #9
UrSv is offline UrSv  Sweden
diyAudio Member
 
UrSv's Avatar
 
Join Date: Jan 2002
Location: Sweden
Quote:
Originally posted by TonyF
Hello Paddy. How about 1.14 GBP +VAT + postage !!!!
I am really surprised that a request for info on a modern replace would yield such a response. I have asked him to say what the transistor is/

I may not get a reply ..
Cheers Tony
Seems very reasonable and would have gone for it without hesitation.
__________________
UrSv
Those who say it can't be done should not stop those who are doing it.
  Reply With Quote
Old 8th September 2004, 09:43 PM   #10
R.I.P.
 
Graham Maynard's Avatar
 
Join Date: Dec 2003
Location: UK
TonyF

I would buy them. Sounds like excellent service to me.

Quad stocked RCA, and the characteristics matched their design for stability and sound etc.

There were two versions of your amplifier - relating to slightly different bias setting arrangements. Serial no. is relevent for that.

You would probably pay near that for quality substitutes anyway, and you still won't be sure they match.

Cheers ........... Graham.
  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
Quad 33 Please help!!! puska Solid State 16 26th September 2011 03:46 PM
New Output Transistors for a Quad 405 (2) askbojesen Solid State 19 25th July 2007 10:51 PM
Matched Transistors (quad PNP arays) rtarbell Parts 5 17th September 2005 10:44 PM
Quad 405 with MOSFET PWR transistors drbobee Solid State 0 31st July 2005 11:16 AM
Quad 520F output transistors?? andjur78 Solid State 1 13th May 2005 07:54 AM


New To Site? Need Help?

All times are GMT. The time now is 05:53 AM.


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