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
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
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!
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!
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.
If push comes to shove send me the motor and PSU and I will have a look-NO guarantees.
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
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
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!
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!
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.dll?ViewItem&ssPageName=STRK:MEWAX:IT&item=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.
My board is very similar to this one (below) albeit with more big caps.
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWAX:IT&item=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.
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?
http://www.maplin.co.uk/Module.aspx?ModuleNo=11992
What phono input have you got?
Using my MF A200 which has mm and MC.
Last time I owned a LPT I think I used an AT- OC5 but may be wrong.
It cost about £100 in the early 1990's. It worked in the A200
albeit with not great detail. I think it was quite low o/p.
I had a MF MX Mk2 pre-amp and pair of MA50's on loan from English Audio. After three days of warming up the MX the sound was
breathtaking but I decided I couldn't afford to have a good vinyl and digital source at the time.
I imagine something as good as that cartridge would be quite expensive now - it was then.
I think I would like to end up with a decent mc cartridge but
will probably have to go for something cheaper at first - probably around £100.
Last time I owned a LPT I think I used an AT- OC5 but may be wrong.
It cost about £100 in the early 1990's. It worked in the A200
albeit with not great detail. I think it was quite low o/p.
I had a MF MX Mk2 pre-amp and pair of MA50's on loan from English Audio. After three days of warming up the MX the sound was
breathtaking but I decided I couldn't afford to have a good vinyl and digital source at the time.
I imagine something as good as that cartridge would be quite expensive now - it was then.
I think I would like to end up with a decent mc cartridge but
will probably have to go for something cheaper at first - probably around £100.
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