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Need help with Linn Valhalla repair
Need help with Linn Valhalla repair
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Old 21st December 2018, 06:27 PM   #51
pebwis is offline pebwis
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Join Date: Mar 2015
I have a similar problem to the one you described.
Did you get the Valhalla operating?
If so, what components did you replace?
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Old 14th January 2019, 01:12 PM   #52
diybry is offline diybry
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Join Date: Apr 2014
Location: yorkshire
Yes, I got it working again, components changed were those previously posted.
Here are the steps I followed, many thanks to neiljadman on another forum
Solder C3 correctly to the top side in addition to the underside.
Replace R26 Making sure to solder the top side connection here too!.
Remove, check and replace D2 as necessary (any generic 1N4148 diode will do).
Test R24 and R37 in circuit, replace as necessary
Remove, test and refit or replace TR4 as necessary (plenty of info on the web as to how to).
Fire it up and see if it works - it will not flare up
Remove, test and refit or replace TR2/3 as necessary
Fit new IC1 and try again
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Old 14th January 2019, 10:28 PM   #53
pebwis is offline pebwis
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Join Date: Mar 2015
Thanks for the reply.
My problem was caused by failing to solder top side of C3.Re soldered C3 and then
Replaced all the parts you mention above, doesn’t blow the fuse now but still not working.
Only difference is that I used BUL45D2G to replace TR2,3,4.
Can anyone tell me if my choice of transistors is ok ?
Any help would be much appreciated.
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Old 15th January 2019, 09:38 AM   #54
diybry is offline diybry
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Join Date: Apr 2014
Location: yorkshire
Hi, I used BUX85G on the recommendation from another forum. I'm not sure whether your BUL45D2G is a direct replacement for the original, however here's a link to the schematic, which shows a few substitutions.
http://www.turntablepsu.com/images/v...0schematic.pdf
Not sure where you are based, but if in UK/Europe, here's where I purchased the BUX85G £1 each.
BUX85G | ON Semi BUX85G NPN Transistor, 2 A, 450 V, 3-Pin TO-220AB | RS Components
Have you replaced R1 and upgraded the bridge rectifier? Apparently the rectifier is prone to damage.
Google 'valhalla meltdown' to see the guidance I was given. Having said that, this thread probably has all the info you need already...
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Old 15th January 2019, 10:38 AM   #55
pebwis is offline pebwis
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Join Date: Mar 2015
I’ll check out the BUX85G and will probably change the ones I have.
I started out replacing the three big electrolytic capacitors , rectifier and R1( I fitted the SG240 varistor (?). Also did the diode mod for the motor.
Decided to replace all the electrolytics and that’s when my problems started.
After popping the fuse and burning out R26, I Searched forums and found the C3 solder info.
I’ve been chasing the fault ever since.
Also replaced D2 diode, tested another couple of resistors and replaced IC1.
Don’t know where to go next.
Maybe abandon the Valhalla and build an Armageddon clone?
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Old 15th January 2019, 11:19 AM   #56
diybry is offline diybry
diyAudio Member
 
Join Date: Apr 2014
Location: yorkshire
Was it working before you started working on it?
When I burned out R26, it took TR2 and TR4 with it.
Did you solder R26 as well as C3 to the top plate?
I'd also re-check all your soldered connections- I checked mine using a DMM and found a high resistance/dry joint on a rectifier leg.
Also check for any solder shorts across tracks?
You could also try posting on the valhalla meltdown thread I started, there are some very helpful and knowledgeable people watching it.
good luck
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Old 15th January 2019, 12:29 PM   #57
pebwis is offline pebwis
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Join Date: Mar 2015
Cheers, I’ll try that too.
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Old 28th January 2019, 04:26 PM   #58
pebwis is offline pebwis
diyAudio Member
 
Join Date: Mar 2015
Update on my previous post.
While I am deciding what to do with the Valhalla, I built an Armageddon clone.
Got it hooked up yesterday to test it and with a bit of capacitor matching it’s up and running.
I’ll test it for a few weeks, while I work on the wooden enclosure.
First impressions are really good & I might not go back to the Valhalla!
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Old 25th May 2019, 03:03 PM   #59
pebwis is offline pebwis
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Join Date: Mar 2015
Default Valhalla update

Just thought Iíd update my post.
Hopefully Iíve managed to include some photos, two of my Armageddon power supply and the other of the LP12 wiring conversion.
More than enough happy with the performance, so Iíll leave the Valhalla repair for now!
Attached Images
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File Type: jpg 3072A871-B164-4B0D-9EAB-7F3089DBD4FB.jpg (613.6 KB, 28 views)
File Type: jpg 337DC25F-2500-4320-B45D-D15839C7279F.jpg (636.4 KB, 27 views)
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