H.H. Scott LK-60 Integrated Amplifier

DavidGoncalv

DavidGoncalv

Active Member
Gotten for free, off Freecycle. 2 of these beauties, one with a tone circuit issue, the other a parts rig. Both in wood cases, nice looking front panels and knobs, and the complete assembly manuals with all the paperwork (included receipts and warrantee cards). Given away by the original builder.

The photos, as blurry as they are, cheat a little. I've cleaned the front panel and knobs, and refinished the case. But since I've yet to spend money on stuff for it, it's still free...right?
 

Attachments

  • scott1.JPG
    scott1.JPG
    48.9 KB · Views: 338
  • scott2.JPG
    scott2.JPG
    49.2 KB · Views: 237
  • scott3.JPG
    scott3.JPG
    49.7 KB · Views: 256
  • scott4.JPG
    scott4.JPG
    35.6 KB · Views: 186
  • scott5.JPG
    scott5.JPG
    42.6 KB · Views: 217
Register to hide this ad
I read the description and compared it to the design of the LK-60 - yes, they appear to be the same, right down to the boards used. BTW, the boards are preassembled and tested - this was not a Heathkit in that regard. All the kit-builder did was solder the wires and chassis compoents, and do a bunch of mechanical assembly.

Attached is a scan of the output section - much easier to understand than that website's drawing.

Whenever I see somebody mashing together comments on particular topologies and sonic preference WITHOUT some data, I ignore it. Which, BTW, check this out:

http://users.ece.gatech.edu/~mleach/papers/TubeVsTrans.pdf

Not promising anything, but if I remember to, I'll post photos as I rebuild it.
 

Attachments

  • schematic.jpg
    schematic.jpg
    170.3 KB · Views: 177
Last edited:
DavidGoncalv said:
I read the description and compared it to the design of the LK-60 - yes, they appear to be the same, right down to the boards used. BTW, the boards are preassembled and tested - this was not a Heathkit in that regard. All the kit-builder did was solder the wires and chassis compoents, and do a bunch of mechanical assembly.

Attached is a scan of the output section - much easier to understand than that website's drawing.

Whenever I see somebody mashing together comments on particular topologies and sonic preference WITHOUT some data, I ignore it. Which, BTW, check this out:

http://users.ece.gatech.edu/~mleach/papers/TubeVsTrans.pdf

Not promising anything, but if I remember to, I'll post photos as I rebuild it.
Click to expand...

I bought a Scottkit LK-60 off ebay last week and it comes with the original builders book. It listed for $180.00 in 1965 and I got it from the second owner.. I just hope UPS don't lose it or..or..or.. :tears:

I'm having trouble uploading photos today.. all of them fail.. usually its no problem!
 
DavidGoncalv said:
Gotten for free, off Freecycle. 2 of these beauties, one with a tone circuit issue, the other a parts rig. Both in wood cases, nice looking front panels and knobs, and the complete assembly manuals with all the paperwork (included receipts and warrantee cards). Given away by the original builder.

The photos, as blurry as they are, cheat a little. I've cleaned the front panel and knobs, and refinished the case. But since I've yet to spend money on stuff for it, it's still free...right?
Click to expand...

I sure would like to talk you out of one of those wood cases for my Scott LK-60... It is begging to be wrapped in wood!
 
I do have this spare case...but in trying to repair a section of veneer in the rear corner, I chipped out a 1" square section. :tears: If you don't mind waiting for me to repair it, you may have it for the cost of shipping.

I bought the capacitors for the rebuild this week, and I finished off the alignment of my KLH 21 receiver. Work on the LK-60 will soon begin.

Hey - just to let you know - that panel lettering is fragile and only silkscreened on - no hard scrubbing or you'll lose them.
 
DavidGoncalv said:
I do have this spare case...but in trying to repair a section of veneer in the rear corner, I chipped out a 1" square section. :tears: If you don't mind waiting for me to repair it, you may have it for the cost of shipping.

I bought the capacitors for the rebuild this week, and I finished off the alignment of my KLH 21 receiver. Work on the LK-60 will soon begin.

Hey - just to let you know - that panel lettering is fragile and only silkscreened on - no hard scrubbing or you'll lose them.
Click to expand...

I don't mind waiting at all!.. or I'll repair it so you don't have to! That would be soo0 cool!

Check out this link to free schematics.. I couldn't find the LK 60, but there are a lot of Scott info there..
http://www.one-electron.com/FC_Consumer.html
 
Make sure your photos aren't larger than the limit. Thanks for the link, but we both own the original manuals, don't we?
 
DavidGoncalv said:
Make sure your photos aren't larger than the limit. Thanks for the link, but we both own the original manuals, don't we?
Click to expand...

I know, thats the kicker!.. You got a better deal though..:thmbsp: Mine cost $51.00 + shipping, but I'm not gonna whine about it..
 
I bit the bullet. I could not find an axial capacitor series that would fit all of the values without selecting far larger voltage rating, and while the old caps were big, they weren't that big. So, Sprague TVA Atoms it was. Making that decision made the work easy, since they fit very nicely and you can get old-fashioned values (5uF, 50uF, those wonderful old round numbers).

I also spent a bit more for screw terminal can caps of the same diameter, so they dropped right in. Large crimp terminals made the reattachment easy.

Each of the boards (preamplifier, tone, and driver boards), was removed and all the capacitors clipped out. One photo shows a reworked board, it looks much neater than the original, to the left.

The wire insulation on this amplifer is PVC, and it melts/shrinks when heated. When it comes time to reinstall the boards, I'm going to heat-shrink all of the connections.

Good late night work.

You might think - hey, how are you going to wire all that back up? So many connections! As this was a kit using prebuilt boards, all the instruction manual describes as how/which color wire goes where. My manual is my notes!
 

Attachments

  • scott1.JPG
    scott1.JPG
    28.7 KB · Views: 268
  • scott2.JPG
    scott2.JPG
    27.9 KB · Views: 236
  • scott3.JPG
    scott3.JPG
    31 KB · Views: 251
Last edited:
I had forgotten if I had promised it before, but if you want, I can provide you a Mouser recap list on this. I used high-quality axials, so it'll be about $90 in parts, but you will really not be able to do much better in quality and size. Everything I bought fits perfectly (see above), and when I get those last two 250 uF 16V caps to drop in, I'm certain its going to sound nice.
 
yes, please do add that also.

i have a list of fets that i need to order for some older car audio amps and i will just add those to it.
 
DavidGoncalv said:
I had forgotten if I had promised it before, but if you want, I can provide you a Mouser recap list on this. I used high-quality axials, so it'll be about $90 in parts, but you will really not be able to do much better in quality and size. Everything I bought fits perfectly (see above), and when I get those last two 250 uF 16V caps to drop in, I'm certain its going to sound nice.
Click to expand...

Hey David, I finally got my Scott LK-60 in and it has a weak channel and if its no trouble I would also be interested in a Recap list. You can send one to my yahoo addy and I'll try to repay the favor somehow.. countryslim01@yahoo. I have a 72 page book on these amps but an up to date parts list to update mine like you are doing.. Also, keep me in mind on the extra Wood Cab you have if you want to get off the extra one.:yes:

I really need to scan the Scottkit book I have so I can share it..
 
Last edited:
While this post is worthless without pics...

I finished the electrical work last night; the rebuild PC boards were mounted back into the case, each wire soldered back into the exact place (you NEED the full manual for this). This is a neat kit - they have an 'INITIAL TEST' position to allow you to determine if you dead-shorting something without destroying the amp. It passed in the first go. Step by step I balance and bias the right and let sides...then hook it up to my iPod shuffle, and it sounds rough, but it now has stereo. With a little debugging, the problem is resolved, and glorious, rich sound is coming from the KLH 24s I've hooked up to them.

I have the pair running now for a burn-out period. Then I'll run the detailed test procedure in the manual, button it up and I'm done! Another classic restored.

But, alas, I lost my camera!
 
You must log in or register to reply here.
Back
Top Bottom