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Old

Help with technics se-m100 rebuild!

Posted 3rd November 2009 at 07:24 AM by Jo90

Hi, I hope I have this right- I am new to this! I am dusting off my electronics by rebuilding an old technics se-m100 power amplifier (1989) as a practice run (before upgrading my marantx cd-80). I bought this very cheaply, but it sounds rather thin compared to my old sugden's! I have had difficulty getting exact capacitor matches for the electrolytics in terms of voltage (not capacitance). I have ended up having to use 10v or 16v capacitors, in place of originals rated at 6.3v. Equally I have had to replace capacitors rated at 25v with those at 35v. They are nearly all in the signal path, and so I have used elna cerafines or silmics. Is this going to be OK?- I couldn't see why not, but, am I missing something obvious? In principle it is quite a nice amp (dual mono, big power supplies), so even though this is a practice run, I don't want to break it! Apologies for the ignorance of the question and thanks for any help!
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Old

The Truly Unexpected -

Posted 2nd November 2009 at 06:51 PM by tomtt
Updated 8th January 2010 at 07:41 PM by tomtt (320)

Click the image to open in full size.Click the image to open in full size.

Maybe i should have thanked Her,

Sooner, than i have,

for those Unexpected Presents.

Of Things, I really liked.

the kind that make life worth living ...





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Last Activity: Today 02:49 PM
Current Activity: Deleting Visitor Message

(one of mine)

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some propaganda in here -

The Story of the Moffat & Company Gold Coins
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Old

K2-wj

Posted 2nd November 2009 at 04:32 AM by jimn1

OPAMP History
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Old

Tube Voltage Regulator, Is it worth the effort

Posted 27th October 2009 at 10:31 PM by DougL
Updated 13th January 2010 at 08:53 PM by DougL

This thread has some good, solid information and very little bravado.

http://www.diyaudio.com/forums/tubes...th-effort.html

Special Mention to:
janneman
Tubelab
kevinkr
Allen Wright
Bas Horneman
SY

For their interesting contributions.

IMHO, There are several ways to make an adequate Power supply. And several ways to totally botch the job.

In the 1980's, I was totally against using solid state in a tube preamp. However, this was more about not using low voltage devices in high voltage circuits than anything else.
Now that high voltage transistors are available this is not a major consideration.
My first tube amp is going to be a platform to play with some of the discussions.
I want to try unregulated and regulated power supplies. I will probably start out with unregulated choke input supplies.

It...
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Old

In Need of plate amplifier under $40 for 8" sub!

Posted 27th October 2009 at 01:32 AM by Skywalker2012

Hi I'm in need of a plate amplifier for a 8" sub if anyone has one preferrably under $40
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Old

Giant Robot

Posted 22nd October 2009 at 10:47 PM by tomtt
Updated 28th October 2009 at 02:50 PM by Jason (Title breaking forum front page in IE)

Quote:
Originally Posted by chrisb View Post
sorry Greg, but this is a Cylon

Click the image to open in full size.


high efficiency, full-range, but not necessarily single-ended
like a 'Giant Robot Pilot', on R&R ...


Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.
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Old

GPA's

Posted 21st October 2009 at 09:31 PM by tomtt

on the cover of MJ -



Click the image to open in full size.


and a pizza ...


Click the image to open in full size.
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Old

First holes have been drilled...

Posted 19th October 2009 at 08:07 PM by Bas Horneman (Bas Horneman's diyAudio.com blog)

Mock up pictures. The wooden "boxes" are from Ikea and will cover the output transformers. The single power transformer shown will be put under the chassis.
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Old

Building the Baby Huey EL84 PP

Posted 19th October 2009 at 03:08 PM by Bas Horneman (Bas Horneman's diyAudio.com blog)

As a way to kick off my project. I decided to pour the Baby Huey thread into a wiki form. So that I would have all "necessary" info in one spot. And hopefully so would other prospective builders.

Baby Huey PP EL84
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Old

Cleaning up the mess

Posted 12th October 2009 at 10:00 AM by peranders
Updated 12th November 2011 at 03:40 PM by peranders

BPA300 Group Buy Round 2

The user rhysh started to organize group buys last year and it started well in true diyaudio spirit but somewhere in February, March things were starting to going out of hand and more and more people were getting irritated about zero deliveries.

By then I started to clean up group buy wiki pages and stumbled over Rhys' pages. I noticed the irritation and started to bug Rhys when he eventually sent me an email telling me to stop.

I kept a low profile for a while in hoping for the better. Unfortunately not much happened. Later on I'll decided to help him with the administration. I set up a forum for me and him. This didn't turn out well. He didn't sign in as the thought was and didn't do his share.

Some time later an idea came up that he should send all his stuff to me and Sweden but in the meantime AlanElsdon offered to drive from south of England up to Sheffield but then it was already too late since Rhys...
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