Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

Technics SE-C01 power amp
Technics SE-C01 power amp
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 17th July 2015, 11:13 AM   #1
Carlosraj is offline Carlosraj  United Kingdom
diyAudio Member
Join Date: Jan 2010
Default Technics SE-C01 power amp

Dear Friends,

I am working on this amp that belongs to a friend. It comes in 3 units which are compact, very much smaller than normal units. It consists of (1) SU-C01 the preamp (2) SE-C01 the DC power amp and SH-C01 the power supply unit. The preamp has its own power supply but the power supply for the power amp comes from the SH-C01. The amp works OK, the problem is, as I increase the volume some where about half volume onwards the power amp cuts. I can heard the click and the sound goes off. This is the first time that I came across this sort of problem. I checked for DC in the outputs but none.
I would be very thankful if someone could advice me on what could be the problem. Could it be the power supply. Please assist.


  Reply With Quote
Old 18th July 2015, 05:12 PM   #2
sgrossklass is offline sgrossklass  Germany
diyAudio Member
Join Date: Nov 2004
Location: Germany
*downloads docs* That's a bit of an odd amp. Input Gnd connects to chassis via a polar electrolytic (!). You can probably guess what that means after 3.5 decades. A new low-leakage part would seem in order there (does anyone still make quality bipolars? otherwise use two low-leakage ones back-to-back if need be).

Anyway, the input seems to be DC-coupled. It would thus seem likely that the preamp SU-C01 produces a variable DC offset. Smells like leaky coupling caps. Both C307 and C317 or right-channel equivalents must be leaky for this to happen. It's probably about time for a complete recapping job, at least around the EQ amp, where there are just a few to begin with. Note C317/318 are given as bipolar, probably because they are barely ever seeing any DC and should keep off any kind of DC voltages in case of a fault.

There's a remote possibility of oscillation being involved, too. Funny things can happen if the power amp gets into preamp supplies, though I don't see how that should be happening here.

Like I said, consider a complete recapping job. Section by section, not all at once, but I guess you know that. And low-leakage around pots, of course.

EDIT: Looks like at least Nichicon still make good nonpolars, though I'd check dimensions first.

Last edited by sgrossklass; 18th July 2015 at 05:19 PM.
  Reply With Quote
Old 7th December 2017, 04:41 AM   #3
inakaguy is offline inakaguy  Japan
diyAudio Member
Join Date: Dec 2017
I have one of these and I'm considering having it refurbished. Can either of you give an opinion on the value of a refurbished SE-C01 / SU-C01 system vs something I could buy for the cost of having it refurbished? Thanks for any opinions...
  Reply With Quote


Technics SE-C01 power ampHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Power Amp of Technics SU-V90D Loavn Solid State 13 25th March 2015 10:47 AM
Looking for Schematic for Technics SE-C01 moray james Solid State 6 4th August 2014 04:04 PM
Technics SE-9600 Stereo Power Amp PhantomBox Solid State 2 27th April 2010 09:02 PM
Unbelievable Slovenian Technics Power Amp DIYIdaho Solid State 1 13th December 2009 04:02 PM
High Freq. AC Power for Filaments of 300B SE Power Amp? snoopyma Tubes / Valves 6 3rd January 2004 06:21 PM

New To Site? Need Help?

All times are GMT. The time now is 05:54 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio