Philips 603 record player output transistors? - UK Vintage Radio Repair and Restoration Discussion Forum

barrywebb · 8th Feb 2018, 12:25 pm

Hi i've been given a Philips 603 record player with no output on one channel i have looked about and it seems it needs new output Transistors can anyone tell me what type and specs of transistors to get hold of for it?

Barry.

Peter.N. · 8th Feb 2018, 12:31 pm

Are there not any numbers on the transistors?

Peter

barrywebb · 8th Feb 2018, 12:39 pm

Hi I've not opened it yet.

Barry

Cobaltblue · 8th Feb 2018, 4:11 pm

Hi the transistor types are given on the radiomuseum

https://www.radiomuseum.org/r/philip...?language_id=2

To my surprise they are in the main Germanium

It also has an integarated circuit in the audio side.

https://www.radiomuseum.org/tubes/tube_sbf3a.html

Cheers

Mike T

AC/HL · 8th Feb 2018, 4:11 pm

Quote:

Originally Posted by barrywebb

Hi I've not opened it yet.

That seems a good place to start!
The transistors are AC187 and AC188: http://85.144.192.2/nvhr/Philips_22GF603.pdf

Herald1360 · 8th Feb 2018, 6:44 pm

Ouch! Looks like that circuit depends on lots of NFB to squash any crossover distortion. Maybe acceptable with Ge devices but still a bit naff.

GeoffK · 8th Feb 2018, 8:30 pm

Would be better to diagnose the fault rather than guess what it is.

roffe · 9th Feb 2018, 12:08 pm

In my experience the SBF3A is the likely problem.

AC/HL · 9th Feb 2018, 1:40 pm

If so, that's bad news: http://www.philipsradios.nl/forum/in...hread&id=18786

Boom · 9th Feb 2018, 6:55 pm

On ebay for a heart stopping £28.99!

Plus you don't yet know what else it might want.

http://www.ebay.co.uk/itm/SBF3A-Inte...YAAOSwdSNZ4gLx

Edit:- There is a suggestion at the bottom of that thread that you might get away with using a bog standard op-amp.

Herald1360 · 9th Feb 2018, 9:08 pm

I would think that you could. There's nothing exciting about the circuit. It would be easier and better sounding just to substitute purpose made audio power amp chips, though, if a working repair is the aim, not restoration.

AC/HL · 9th Feb 2018, 11:56 pm

Notwithstanding the previous posts, with a bit of luck Barry may be right and all he needs is the transistors. Please let us know the outcome.

8th Feb 2018, 12:25 pm	#1
barrywebb Tetrode Join Date: Nov 2013 Location: Redruth, Cornwall, UK. Posts: 85	Philips 603 record player output transistors? Hi i've been given a Philips 603 record player with no output on one channel i have looked about and it seems it needs new output Transistors can anyone tell me what type and specs of transistors to get hold of for it? Barry. Last edited by Station X; 8th Feb 2018 at 1:04 pm.

8th Feb 2018, 12:31 pm	#2
Peter.N. Dekatron Join Date: Jul 2008 Location: Charmouth, Dorset, UK. Posts: 3,601	Re: Philips 603 record player output transistors Are there not any numbers on the transistors? Peter

8th Feb 2018, 12:39 pm	#3
barrywebb Tetrode Join Date: Nov 2013 Location: Redruth, Cornwall, UK. Posts: 85	Re: Philips 603 record player output transistors Hi I've not opened it yet. Barry Last edited by Station X; 8th Feb 2018 at 1:04 pm. Reason: Thread title edited.

8th Feb 2018, 4:11 pm	#4
Cobaltblue Moderator Join Date: Dec 2010 Location: Exeter, Devon and Poole, Dorset UK. Posts: 6,878	Re: Philips 603 record player output transistors? Hi the transistor types are given on the radiomuseum https://www.radiomuseum.org/r/philip...?language_id=2 To my surprise they are in the main Germanium It also has an integarated circuit in the audio side. https://www.radiomuseum.org/tubes/tube_sbf3a.html Cheers Mike T __________________ Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk

8th Feb 2018, 6:44 pm	#6
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,536	Re: Philips 603 record player output transistors? Ouch! Looks like that circuit depends on lots of NFB to squash any crossover distortion. Maybe acceptable with Ge devices but still a bit naff. __________________ ....__________ ....\|____\|\|__\|__\_____ .=.\| _---\__\|__\|_---_\|. .........O..Chris....O

8th Feb 2018, 8:30 pm	#7
GeoffK Heptode Join Date: Mar 2016 Location: Essex, UK. Posts: 602	Re: Philips 603 record player output transistors? Would be better to diagnose the fault rather than guess what it is. __________________ *Geoff*

9th Feb 2018, 12:08 pm	#8
roffe Hexode Join Date: Nov 2003 Location: Linkoping, Sweden Posts: 493	Re: Philips 603 record player output transistors? In my experience the SBF3A is the likely problem.

9th Feb 2018, 1:40 pm	#9
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,642	Re: Philips 603 record player output transistors? If so, that's bad news: http://www.philipsradios.nl/forum/in...hread&id=18786

9th Feb 2018, 6:55 pm	#10
Boom Retired Dormant Member Join Date: Jan 2007 Location: Westbury, Wiltshire, UK. Posts: 2,451	Re: Philips 603 record player output transistors? On ebay for a heart stopping £28.99! Plus you don't yet know what else it might want. http://www.ebay.co.uk/itm/SBF3A-Inte...YAAOSwdSNZ4gLx Edit:- There is a suggestion at the bottom of that thread that you might get away with using a bog standard op-amp.

9th Feb 2018, 9:08 pm	#11
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,536	Re: Philips 603 record player output transistors? I would think that you could. There's nothing exciting about the circuit. It would be easier and better sounding just to substitute purpose made audio power amp chips, though, if a working repair is the aim, not restoration. __________________ ....__________ ....\|____\|\|__\|__\_____ .=.\| _---\__\|__\|_---_\|. .........O..Chris....O

9th Feb 2018, 11:56 pm	#12
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,642	Re: Philips 603 record player output transistors? Notwithstanding the previous posts, with a bit of luck Barry may be right and all he needs is the transistors. Please let us know the outcome.