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Old 8th November 2013, 10:26 AM   #11
Jay1234 is offline Jay1234  United Kingdom
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Much clearer now...

There are a couple of solutions then;

1, a cheep & cheerful version that uses just 3 or 4 components.

Tick Tock, could you post a diagram & component list for the circuit above please, or point me in the right direction please.

2, a much more expensive version of the same thing ie a proper Armageddon clone
that uses an isolation transformer + 3 or 4 components.

Hear; DIY Geddon - LP12 power supply - pink fish media

So wish id had a better look into the Naim version yrs ago.
hindsight is a, bitch......lol
A friend down in Oxford is trying to repair my Valhalla,
but for the future ill knock up at the very least the cheepy version.
When that is i get the use of my hand back.


Jay
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Old 8th November 2013, 10:25 PM   #12
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IMHO the Armageddon (clone) isn't worth the effort (due to expensive transformer + chassis).

Just try Google. Be aware, some describe 50 Hz, some 60 Hz operation !!

All electronic PSUs give 50 Hz sinewaves for 33 rpm, requiring a "50 Hz motor". Older LP12 Basik
PSUs sold in the US came with a "60 Hz motor" (different pulley). I can't tell you quickly if there
are slight cap and resistor value variations.

60 Hz:

Click the image to open in full size.

50 Hz:

Rega Motor Voltage ID Help

Click the image to open in full size.

Click the image to open in full size.

again, Linn Basik PSU:

Click the image to open in full size.

However, if you have a Valhalla which needs repair, read this:

Valhalla repair and update... - pink fish media

I'd prefer both Valhalla, Lingo and Axis PSU over the Armageddon. The Axis does also work
on an LP12, but will need some tweaking to start the heavier LP12 platter. Similarly to the
Lingo it generates higher voltage at start and lower voltage some seconds later, but at a
lower level.
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Last edited by ticktock; 8th November 2013 at 10:32 PM.
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Old 8th November 2013, 11:42 PM   #13
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Quote:
Originally Posted by andyr View Post
And the speed is maintained by the mains frequency.
Not when you're using a Valhalla, Lingo etc. They generate their own frequency, which in the case of the Valhalla, can be either 50Hz, or 60Hz, depending on the crystal oscillator used.

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Old 8th November 2013, 11:51 PM   #14
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It's always 50 Hz with the Valhalla. When an US-LP12 in the 80s was upgraded
from Basik to Valhalla, the kit came with a new (50 Hz pulley) motor.
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Old 9th November 2013, 12:04 AM   #15
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Quote:
Originally Posted by ticktock View Post
It's always 50 Hz with the Valhalla.
Yes, from the factory. You can change it to output 60Hz, that's my point. Comes in handy if you want to drive a motor that has a 60Hz pulley, like a different turntable sold in North America.

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Old 9th November 2013, 12:17 AM   #16
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Of course, Jeff. A different crystal is way cheaper than a new motor.
An old 60 Hz version would be rather old though.
I have to admit I still don't have fully understand Jay's situation.
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Old 9th November 2013, 08:50 AM   #17
Jay1234 is offline Jay1234  United Kingdom
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OH dear it looks like MI5 or the CIA are on to us ladds...... & Out comes the Redacting Pen

It's also said that the simple version is just as good as the expensive transformer Geddon.

Anyone have actual experience of both
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Old 9th November 2013, 08:55 AM   #18
Jay1234 is offline Jay1234  United Kingdom
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explanation later today
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Old 9th November 2013, 09:36 AM   #19
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Quote:
Originally Posted by Jay1234 View Post
It's also said that the simple version is just as good as the expensive transformer Geddon.
The transformer is just providing some kind of filtering which can be done both cheaper
and more effective (EMI filter etc.).
If you have a suitable transformer and chassis on hand - go for it. Otherwise save your
hard earned money or get a used Valhalla/Axis PSU (the latter giving the 45 rpm option).

MI5 and CIA? Hope not. We already have the NSA watching us.
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Old 9th November 2013, 02:09 PM   #20
Jay1234 is offline Jay1234  United Kingdom
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Ok what happened was this .
I decided that I wanted a 45 option for my LP12. So looked about for mods.

Found ones that weren't to difficult that many had used before. So a couple of Resistors some Caps & a new Crystal & hey presto it Worked, great. A real treat to hear some of my 12' 45s again.

However it seemed that maybe my soldering wasn't so good & the Valhalla may off flashed over cos it went pop big style. All the chips the rectifier & who knows what else, it was stuffed.

Nigel down in Oxford said he'd give it a go to try & fix it, its what he does.
10 out of 10 for perseverance, Nige.
It may yet still be salvaged.

So in light of not having anything to play music on, I thought i'd investigate alternative PSUs. The first thing to come up was the Geddon mod Simple But costly due to the Tranny.
Then the much cheeper & also fairly simple or "Basik" PSUs

That All seem (from what you guys are saying) to be better than the Much more complicated & expensive main PSUs.

What advantage these (expensive) ones have it seams, is that they do away with the need for an eco friendly finger push start, to get the plater spinning !
Oh & maybe a 45 option.

Am I grooving on the right track hear?

So to re-cap;
I would like to have as either back up or as a main PSU, for a UK 50Hz
LP12 motor;

A PSU that is,
First of all up to the job of spinning the plater.
If it needs a push start thats ok with me.

Second, that it Keeps the speed right.

Third, that its preferable simple & cheep to construct.
I'd rather pay more for a few good quality components, Than the same or more for lots ( ie complicated ) that didn't really do much of anything. & get hot or go POP

Jay
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