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Old 7th September 2014, 08:18 PM   #1
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Default Michaelson&Austin TVP-1

Does anyone have a schematic or manual for this unit? Previous owner removed parts from board and played with the wiring. I've already checked all of the usual places; can't find a thing. It seems to be a pretty rare piece. ANY help would be greatly appreciated.
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Old 9th September 2014, 11:27 AM   #2
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Hi,

My first ever valve preamp.

The only thing you can find on the internet is a hand drawing of the phono section, no PSU.

http://www.google.be/url?sa=t&rct=j&...74649129,d.bGQ\

Ciao,
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Old 12th September 2014, 02:19 AM   #3
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Anybody? Pretty please..........
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Old 15th October 2014, 04:23 PM   #4
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Default TVA-1 information and schematic

Quote:
Originally Posted by audio king View Post
Anybody? Pretty please..........
Hi audio king,

I have gathered a lot of information from some hi-fi interested people concerning repair and wiring of the Michaelson & Austin , TVA-1 valveamp. .....but not the TVP-1

I shall try to ask about the TVP-1 preamp schematic in UK.

To share the experience with others about amplifiers and speakers, I made a setup on the amateur site called: TUBEAMP .
Unfortunately the company closes their activity , and I have tried to make a copy of the Tubeamp site on Google Sites:

https://sites.google.com/site/httpstubeamp/

The site is under construction, but you will be able to find some answers and links to my Picasa Web about "Tim's Valveamp number 1" , TVA-1.
Tim De Paravicini designed the amplifier for M&A, and I have recently received ground wiring information from a friend in UK.

I assume that TDP made the TVP-1 as well.

I hobe that Google Sites stays with this website possibility... .....

Kim

Last edited by Leakstereo20; 15th October 2014 at 04:32 PM.
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Old 17th October 2014, 01:27 PM   #5
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Quote:
Originally Posted by audio king View Post
Anybody? Pretty please..........

Received this circuit from UK, which could be the phono stage from TVP-1 ?:
Attached Images
File Type: jpg TVP-1.JPG (84.5 KB, 173 views)

Last edited by Leakstereo20; 17th October 2014 at 01:36 PM. Reason: wrong drawing
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Old 17th October 2014, 02:56 PM   #6
kevinkr is offline kevinkr  United States
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I'm pretty sure the connection shown to the grid of the right hand section of the ECC83/12AX7A is a mistake, it should be wired in parallel with the grid on the input side.

Interesting how the HF feedback is taken before the cathode follower with just the extreme LF taken from the output. This would tend to prevent external capacitive loads from affecting the accuracy of the RIAA equalization.

Note most cap values are shown in nF which might be less than obvious at first pass.

The schematic in the previous post seems to be a redraw of the schematic Frank found on google.be.

Something else to note is that the cathode follower section of the second ECC83 is running at 3mA which is pretty high for this type. Seems like a 12DW7 if pinned out correctly might be a better choice in this position.
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Old 17th October 2014, 08:52 PM   #7
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I have found an identical hand-drawn schematic on the web. In that drawing,there is a question mark on the line from the grid of the second triode section and the output of the 100n cap. I'll have to look at the board to verify this.
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Old 17th October 2014, 09:19 PM   #8
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Hi,

That's the one I linked to in post #2.
From memory, I had drawn the complete diagram but lost it somehow, Kevin's analysis is correct.
The line stage uses a pair of ECC82s where one triode section is configured as a current source.
A topology TDP used throughout for the flagship TVP-X.

I used this preamp with Quad ESL 57s and found it to be quite nice sounding although a bit bass shy compared to my second pre a Counterpoint SA5.

The TVP-1 is not an easy unit to restore though with all the coax harnesses and such. My unit had been tampered with as well.

Best,
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Old 18th October 2014, 09:28 AM   #9
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Quote:
Originally Posted by audio king View Post
I have found an identical hand-drawn schematic on the web. In that drawing,there is a question mark on the line from the grid of the second triode section and the output of the 100n cap. I'll have to look at the board to verify this.
My friend from UK also found the mistake with connection from grid nr. 2 to the capacitor..... should have been to grid nr. 1

It seems that you have sufficient help with your preamp now....................
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Old 24th October 2014, 12:57 PM   #10
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Quote:
Originally Posted by audio king View Post
Does anyone have a schematic or manual for this unit? Previous owner removed parts from board and played with the wiring. I've already checked all of the usual places; can't find a thing. It seems to be a pretty rare piece. ANY help would be greatly appreciated.
I have asked Papworth Audio Technology about the TVP-1 schematic, and I was told, that they never received the schematic, when they purchased the company...the company that actually made the TVP-1.

A guy in US owns the TVP-1 and he intends to make a drawing from the preamp. This work may take a while, so I could suggest as follows:

You could take a close up picture of your preamp PCB from the component side ( may be two pictures if the PCB is a A4 size), and after that one or two pictures from the soldering side, and post the pictures . Then we might have a chance to make the schematic.

Overall, it's limited how many ways valves in a preamp can be connected.

Some people has erlier tried to ask T.d.P., but the general guess was, that T.d.P would not make the circuit available.
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