Scott LK-72-B

radioterry

radioterry

Active Member
I picked up a Scott LK-72-B off of CL for $80. It is in very nice shape and I would like to begin restoring it. Before I begin restoration, I have a few questions:

. I understand that there were several versions of this particular model, how do I go about identifying mine in order to get the correct schematic?
. Once identified, where can I find the schematic?
. What does the "B" stand for...as opposed to the LK-72?
. When restoring it, is there anything in particular that I should to look out for?

NOTE: This is my first piece of HH Scott gear...I do have a few EH Scott radios (Philharmonic & AW15).


TIA & BR,

Terry
 
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I am not sure what the "B" stands for, but I do know that some of the H.H.Scott amplifiers were in kit form. I built an LK-48 years ago but I found out that there was a factory built version also.

I don't have their website offhand but I have visited it. Google H.H.Scott.
 
radioterry,

You've got a great amp there--and for a great price to boot!:banana:

gugusse was kind enough to post a link to the schematic.

Have you done any restoration work on tube amps before? If not, a good pic of the underside of your amp would be very helpful as well.

That would allow me to take the images into photoshop and circle parts to be replaced, and match the circles up between the schematic and photo so you have a real-world reference for where those parts are...

I know most of what needs to be replaced on your amp--I restored a few Scott 299Cs. The LK72 is the kit form of the 299C.

I'd also be more than happy to circle replacements that I missed, other parts to be replaced, etc. that other members point out.:D

Lemme know if you're interested. If you got a handle on it on your own and don't need any help from a schmoe like me, I won't be offended at all, just offering to help if I can.:thmbsp:

Best,

John
 
radioterry said:
I picked up a Scott LK-72-B off of CL for $80. It is in very nice shape and I would like to being restoring it. Before I begin restoration, I have a few questions:

. I understand that there were several versions of this particular model, how do I go about identifying mine in order to get the correct schematic?
. Once identified, where can I find the schematic?
. What does the "B" stand for...as opposed to the LK-72?
. When restoring it, is there anything in particular that I should to look out for?

NOTE: This is my first piece of HH Scott gear...I do have a few EH Scott radios (Philharmonic & AW15).


TIA & BR,

Terry
Click to expand...

You'll need to visually match up internal components on your LK72 with one of the schematics. Just be aware that the amp itself is the true schematic. Start with the LK72B schematic, and work from that point. You'll most likely find a couple of component value changes here and there. My LK72A was actually closer to one of the 299C schematics (with a couple of changes).

The 'B' suffix was a design change with lots of goodies added to the 'A' design. Headphone jack, bias switch, test points, bias pots, speaker switch, etc. The 'B' design came out around August 1963.

Do a search here in the tube forum to find out which components typically need replacement. There are several.

. . Falcon
 
cademan/Patrice:

Thank you very much for pointing me to the website/schematic.

John (heekma):

Thank you for your generous offer, I will take you up on it. I have done quite a bit of tube radio/amp troubleshooting and repair....but this is my first HH Scott and I welcome the help. I will take some pictures, as you suggested, this weekend and send them to you.

Falcon:

Thank you for the suggestion. I will do an AK Tube Forum search and look for the component information.


KVflyer:

Thank you, I'll google the 299D.

BR,

Terry
 
No problem radioterry--just glad to be of help!

I you would, post 'em here in your thread rather than a PM. Other members can follow along if they wish, and other members can/will catch things I miss in my photoshop treatments of the schematic/underside pics.

BTW, I LOVED my Scott 299C. A great amp with a great phono section to boot. Tough to beat.

Keep us posted!

John
 
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