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In Reply to: RE: Recs for Tubes & tweaks for HH Scott gear posted by CNemo on April 15, 2017 at 12:16:08
Thermi,Mike, Uncle Mike, and Eli
Thanks for all the posts and good suggestions. A little more background for you all.
Both units have been to a tech who gave them a pretty good going over with a minimalist approach replacing things, trying to get things back to original spec, and replacing as little as possible and trying to keep the unit as close to original stock as possible. Pic of some of the work around the amp right Channel is posted as an attachment
Looked over his notes from the repair slips, and he replaced about a dozen caps, half-a-dozen resistors, and the power transformer on the amp. Pre was in better shape and only about 6 caps replaced there. I opened up the bottom of the amp took a quick look around this morning and there were some old Ceracap and old big black Sprague capacitors with red lettering still in there. It should be in decent shape and his run Fairly reliablly every year too, but there is probably still more that can be done to improve both reliability,function and sound.
I we'll try mixing and matching these with other amps and preamps,but it may take me a while to get to that. A decent set of matched output tubes on the pre may also help, but will wait till I try some things with different amps and preamps before investing in any new tubes.
Would appreciate any additional thoughts any of you or anyone else out there may have about things to check out and think about forgetting the gear sounding a little bit better.
Thanks, CN
Follow Ups:
The Cera-Caps Must go, they are known to fail and are way past their prime. The electrolytics should only be in the power supply and replaced if not already done. The power supply rectifier is long overdue (probable a Siemens) if it has not been replaced. The ones halfway down in the link are good. A note on replacing the recitifier: because a new one is more efficient than the old a dropping resistor will need to be added after the new rectifier to bring the voltage back in line. I would replace the "black beauty" caps as well. A nice mix of 716p orange drops and K40y PIO
for coupling works wonders.
Honestly you are limping things along and not getting the full benefit. So your assessment is not based on a good unit. Replacing tubes now would not give the most benefit because the rest is lacking. I know costs can be a concern especially if you are paying a tech to do the work. However if you go in with a plan as to what you want done you can manage costs.
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