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Unavoidable micro hum? What exactly are you referring to as "micro hum"? With input jacks shorted what is the residue measure ac across an 8 ohm dummy load on the 8 ohm taps .. it should be really low like less than 1mV... which is not something someone can hear within a foot of the speaker even...

If you were replying to me with that comment...no not at all. I've designed, rebuilt and repaired countless pieces of tube audio gear in my day... In my vast experience in this field circuits that employ gimmicky stuff like NE2 or insert whatever goofy new fangled reinvent the wheel modern...

well in my opinion redesigning the circuit to get those gimmicky NE2's out of there is the real solution. I can't believe McIntosh stooped to such silloy levels just to sell an otherwise excellent product.....but then that is just me!

Smart move! Not worth the effort.

Ummmmm only a single front end tube per channel in the 208 power amp so that method isn't going to work. My bet is one of the filter caps is failing or someone messed up the grounding scheme or added 3 wire grounded plug or ???? who knows. Properly working Scott amps should not hum at all!!!!

You don't need to change the design in anyway to get the 208 dead silent with your ear within a couple feet of the speakers. If it's humming something is not electrically correct find the problem do not band-aid over it. The engineers at HH Scott knew what they were doing they did not design in...

That'll work!

Does the amp have 2 EL84's per channel? If so no way, could it ever even come close to those power numbers. Pair of EL84 is lucky to squeeze 15 watts per channel and that would be running the dog shit out of them.

$1100......maybe if the knee I'm about to have replaced goes well I'll have to start taking new client again. That is one lucrative price! For the shop that is, of course it depends on what all is included.

I thought I recognized your writing style! Yeah I'm just coming off a nearly a 2 year forced sabbatical from numerous family issues along with a number of health issues that have finally cleared....as of about 6 weeks ago I'm back refurbishing gear. Anyway good to read you again! kvflyer that...

Are your the same Archangel that used too hang on on the Scott list server and forum? If so I seem to recall your name was/is Bill? If so long time since we ran into each other.

Well I'd be getting the above done before making any fleeting comments about why you have a lack of bass especially blaming it on some design flaw that in my opinion and experience does not exist!... I've rebuilt thousands of Scott amps in my day and never hear what your describing myself or...

I'd be careful its very rare to see a transformer in such pristine condition on the inside to fail without some outside influence causing it. I'd be installing some 10 ohm cathode sensing resistors on those output tubes to confirm they are running as intended below 35 ma each.

Yup that is at least part of it but if you keep searching you'll find more elsewhere in the circuit! Yes pecks can be a headache in some situations. But in this case I've never seen them cause the symptom he is describing. I've never heard of anyone complain about the bass response of a 299D in...

No No I don't suggest its your imagination but I can easily give you at least a couple hundred customers that will very firmly disagree with your assessment. I also have a good many X202B customers that would agree with your preference in that respect. Both of those amplifiers "IF" working...

Dynaural Noise Supression on a 299D? Thar circuit is not on any 299D I've ever seen. That circuit was only utilized on the 272 and 296 models if working properly turning those controls all the way down it has no effect at all. As far as low bass response with phono you've got something not...

Fire "your tech" he's flat put horrible. He should know the failure mode of the selenium rectifier is rarely an all out failure to work. Selenium rectifier as they age become resistive so they progressively produce less and less voltage. In the case of the Scott the voltage it produces has a...

:beerchug:

Do you happen to know where that comes from?

Hmmmmmm news to me. Where did you hear this?

Sorry seller is mistaken on those they are indeed pulls from a Scott amplifier and not new. All those leads would be about twice as long and be of similar length to each other. They are tinned and cut to length as they would be used in a Scott amp. No reason not to buy them but thought whomever...

I have to add something to this thread.. a word of caution. I have the 299D here that was sent in "somewhere" for "restore and upgrade" for the cool $1000. The worst work I have ever seen out of a supposed professional.. along with blatant lies on the invoice. I've seen it all...

Gadget, I agree for the most part. My main point is $20 for the new production 5AR4 and it lasting 2, 3, 4 or more years is a bargain... especially if you spend $150 on a vintage one end up not so lucky and it decides to take an early exit on you! It happens even with vintage tubes...

Quick note about all russian made current production 5AR4 regardless of the name and slight outer visual differences all the current production vintage named tubes are the SOVTEK 5AR4 where it counts....on the inside. Getting 5 or 6 years out of a JJ or any current production 5AR4 is doing...

Not sure how you analyzed all the Scott amplifiers you mention. When it comes right down to it the entire Scott integrated amplifier line is more similar than different. The circuits are all closely related with the main differences being maximum power along with bells and whistles. I've rebuilt...