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HH Scott Owners Thread

Dave, I too have a Fisher 400 but it is in the queue as they say. I also have a 299B and a 350B tuner as well. I do not have the 222B. The first in that series that I had was a 222C and never a 272!

On another note, the 233 pictured on my bench will need some work. At 70 volts input, the first filter is warm to the touch. That means that it is not reforming and I will have to stop and replace it now before going any further. Not a big disappointment since I have worked on at least two dozen of these various amplifiers.
 
I hear you. On the first 299B I restored (now owned by my daughter), I tried reforming the caps and seemed to work. However, during some testing I started hearing snapping/cracking noises and found one of the cans very hot (but had not yet exploded, fortunately). From then on, I just replace the power supply caps and all the small electrolytics underneath first thing.
 
Hey Don, did that amp come from Earl out there in them thar hills? That one looks familiar!
 
UPDATE: I am rebuilding the first electrolytic capacitor. As I remove it, it does not match the schematic. It is a 10-10-10-10 µFD @ 500 VDC. Schematic calls for four 20 µFD sections at 500 VDC. As I am removing it, I discovered that it is not original; it's a replacement! It is leaky at 350 VDC. B+ is more than that! No wonder it gets warm...
 
Here are the insides of the electrolytic capacitor once they have been extracted from the can. I did a tutorial years ago on the process that I use.Guts.jpg

And are the four 22 µFD 500 VDC capacitors that are going into the can.

NewGuts.jpg


The amplifier is on the bench again with the voltage ramping up slowly.
 
Sorry to hear about Earl! A fine man, very knowledgeable, and always very helpful! RIP

Good catch on that cap! Was that actually wired in to have two pairs paralleled? I seem to recall Scott doing that on some of the amps I restored over the years. I found I could replace like a quad 20uf with a dual 40uf and be right on spec and true to the schematic. I just figured the use of the quad 20 was a financial or availability call back in the day!
 
Wharfcreek said:
Sorry to hear about Earl! A fine man, very knowledgeable, and always very helpful! RIP

Good catch on that cap! Was that actually wired in to have two pairs paralleled? I seem to recall Scott doing that on some of the amps I restored over the years. I found I could replace like a quad 20uf with a dual 40uf and be right on spec and true to the schematic. I just figured the use of the quad 20 was a financial or availability call back in the day!
Click to expand...
Yes, per the schematic and the wiring, the caps were wired in parallel. I have seen many Scott amplifiers with, for instance, a two-section electrolytic capacitor with the terminals bent toward each other and one wire connecting and soldered to them. I see that lots of time.

What tipped me off that this was a replacement is that when I went to remove three leads from one terminal, they were soldered together and still on a cut off capacitor lug! Obviously, the wrong can was installed.

We'll see how it goes. The next one to check will the the 100-100-100-100 µFD bias/filament supply. In this amplifier, they use two silicon diodes instead of the Siemens Selenium bridge. The 299D/LK-72B did the same.
 
It's alive, now to adjust the output tube bias and balance and let it cook on the bench for a few days. Cosmetic cleanup is next.
 
Wharfcreek said:
Fun stuff Don! Nice Job!
Click to expand...
In a word, "Rewarding". I have a DVD player on the bench as a source. I also have a Philips turntable to check the magnetic inputs.

It's playing "Beatles Abbey Road" now. I will let it cook for a few days.

Next up??? HH Scott 210E amplifiers, two of them. One has been molested; I will probably remove all that was done. The other one? Original...
 
I think I have a pair of those toi. Was always my plan to gut the iron and build a pair of monoblocks out of them. 6L6 tubes, right?
 
Wharfcreek said:
I think I have a pair of those toi. Was always my plan to gut the iron and build a pair of monoblocks out of them. 6L6 tubes, right?
Click to expand...
Output tubes are EL34/6CA7. One amplifier has 6CA7 tubes, the other has Mesa 6L6GC tubes in it. It will be a lot more difficult to work on because of the design of the chassis.
 
OK, not sure if I have the same amps or something different. Mine have been stuck away for a decade or better awaiting my attention. I'm 'pretty' sure mine have some short bottle 6L6s in them, which is what attracted me to them in the first place. Back when I got them I was on a big monoblock kick and these looked like perfect candidates to be converted into something like a Dynaco Mk III kinda thing. That, or maybe find a suitable PT and do a 'Scott' version of a ST-70. But, time has flown by and I've not had them out of the storage box since I got them. I know one was complete and working and cosmetically very good if not excellent. The other was missing knobs, a bit 'worn', and maybe tubeless? Not sure I really recall. I guess at this point their future is unknown as I've really slowed down on the home audio stuff lately having returned to musical instrument (guitar) amps.
 
For some reason I think mine have the OPTs sticking out the back like some Sherwood amps. Champaigne face plate but brown knobs?
 
The 210 went through a lot of changes. Personal opinion is that it should have had different numbers. But you know what opinions are...
 
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