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

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

Can power LPT with Linn PSU?
Can power LPT with Linn PSU?
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
Reply
 
Thread Tools Search this Thread
Old 29th August 2008, 02:08 PM   #1
avinunca is offline avinunca  Europe
diyAudio Member
 
Join Date: Mar 2007
Location: Shrewsbury,UK
Can power LPT with Linn PSU?
Default Can power LPT with Linn PSU?

As far as I know the Linn uses the same Airpac motor as the Pink LPT.
Does anyone know if the PSU's are interchangeable?
I think they are both supplying two 90 degs out of phase supplies.
The Pink is about 100vac per coil.
I see a lot of Linn PSUs on EBay and I wondered if I could use one
on my LPT
  Reply With Quote
Old 31st August 2008, 12:37 PM   #2
abril is offline abril  United Kingdom
diyAudio Member
 
Join Date: Sep 2004
Location: Cornwall
Providing there is between about 85V and 110V on the two phases and the phases are 90deg apart there is absolutely no reason why you cannot (the motors are after all to all intents and purposes the same).
But you may be stuck with 33rpm only?
LPT PSU gone kaput ?
  Reply With Quote
Old 17th February 2009, 08:30 PM   #3
avinunca is offline avinunca  Europe
diyAudio Member
 
Join Date: Mar 2007
Location: Shrewsbury,UK
Can power LPT with Linn PSU?
Well yes and this is the longest repair job in history. I bought a cheap scope and isolating transformer on EBay but I am still put off by the
direct rectified mains of the psu.
Someone is offering a psu on EBay but in my opinion he is asking too much.
There is at least 20v difference between the phases and the motor shudders.
I read somewhere that it could be the phase cap. I remember you saying that the value of mine was wrong at 0.68uF but the one on the EBay psu is the same.
It would be great to have another psu to compare voltages.
Does anyone take on repair jobs on these?
I was looking longingly at my vinyl collection the other day. They haven't been played for 11 years - sob!
  Reply With Quote
Old 18th February 2009, 06:36 AM   #4
abril is offline abril  United Kingdom
diyAudio Member
 
Join Date: Sep 2004
Location: Cornwall
This shuddering with the motor going nowhere and excessive voltage difference between the phases is something you will get if the phase cap value is totally wrong,but I can't understand why this PSU on ebay also has that value-did you ask?

If push comes to shove send me the motor and PSU and I will have a look-NO guarantees.
  Reply With Quote
Old 18th February 2009, 08:24 PM   #5
avinunca is offline avinunca  Europe
diyAudio Member
 
Join Date: Mar 2007
Location: Shrewsbury,UK
Can power LPT with Linn PSU?
I didn't ask about the value. I will try the .22uF.
Thank you for your very kind offer of help. I will see what the cap change does first. I need to order one.
  Reply With Quote
Old 19th February 2009, 06:34 AM   #6
abril is offline abril  United Kingdom
diyAudio Member
 
Join Date: Sep 2004
Location: Cornwall
Beware of tiny wire links underneath.
Beware of voltage rating
Good luck
  Reply With Quote
Old 27th February 2009, 05:48 PM   #7
avinunca is offline avinunca  Europe
diyAudio Member
 
Join Date: Mar 2007
Location: Shrewsbury,UK
Can power LPT with Linn PSU?
Default I've got music!

I changed the phase cap as per Abril's advice and also the electrolytics (except 1uf) for good measure.
After varying the preset pot value I got 81v across the directly connected coil and 90v across the cap fed coil. This is the closest I've seen. I needed to adjust the position of the motor plate because it was rubbing on the platter but in the end it worked and started up nicely.
The voltages at 45rpm were 82v and 130v - scary so I will try some more adjustment. It did play a 45rpm disc fine but I only did it briefly in
case one or more transistors expired.
I opened my box of albums that I hadn't heard for over 10 years
and played them all afternoon. There is a Goldring Elektra fitted to the RB250. I played about with tracking weights using trial and error
- no gauge and I am very pleased indeed with the sound especially through my headphones and Heed Canamp. I couldn't stop my feet tapping! Need to sort out a new cartridge and phono amp now
and then fine tune the phase cap - not necessarily in that order.
Many thanks to Abril
  Reply With Quote
Old 28th February 2009, 06:52 AM   #8
abril is offline abril  United Kingdom
diyAudio Member
 
Join Date: Sep 2004
Location: Cornwall
Great stuff

Would recommend you replace the 1mfd caps with 105C rated parts as they are badly affected by the heat (have you got scorch marks on the board under the row of resistors!)

Try dropping the voltage lower starts OK and runs smoother with 70 and 80V,seem to remember I got a crazy voltage reading like that at 45rpm (it has been over 12 months since I had an LPT).

Still got my box of tricks

Better cartridge first I think!
  Reply With Quote
Old 28th February 2009, 08:32 AM   #9
avinunca is offline avinunca  Europe
diyAudio Member
 
Join Date: Mar 2007
Location: Shrewsbury,UK
Can power LPT with Linn PSU?
Yes I did intend to change the 1uF caps though on my board they are not near the 2W and above resistors.
My board is very similar to this one (below) albeit with more big caps.

http://cgi.ebay.co.uk/ws/eBayISAPI.d...m=290296402083

Farnell where I bought the rest of the gear only had USA import caps at this value/size with 15 delivery.
Will look at some other sources unless you have a suggestion.

Do you have any suggestions for a new cartridge and do you have an opinion on the s/h market.

I am pleased to hear you saw similar voltages at 45rpm. I will try the lowest settings for good start-up etc.

I'm glad you still have the cap changer. The tuning seemed to make a lot of difference to your LPT performance.

Must check the forums for Vinyl sources and cleaning hints. It's been an age since I cleaned an LP.
  Reply With Quote
Old 28th February 2009, 09:23 AM   #10
abril is offline abril  United Kingdom
diyAudio Member
 
Join Date: Sep 2004
Location: Cornwall
I have a vague recollection they were 100V but you will have to check ,in which case

http://www.maplin.co.uk/Module.aspx?ModuleNo=11992

What phono input have you got?
  Reply With Quote

Reply


Can power LPT with Linn PSU?Hide 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
About Linn power amps... Luke123 Chip Amps 26 12th February 2015 06:13 PM
Linn Basik Power Supply Sunsun22 Analogue Source 18 31st October 2005 12:20 AM
Anyone have the Linn LK-2(60) Power Amp Schematic? dtm1962 Solid State 1 2nd April 2004 12:27 AM


New To Site? Need Help?

All times are GMT. The time now is 11:23 PM.


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
Wiki