Self Medicating > DIY Electronics

My Dyna ST70 (?) Project...

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Folsom:
When it comes to tubes a little resistance here and there seems to be your friend... seems like some designers avoid it.

P.I.:

--- Quote from: _Scotty_ on July 10, 2020, 11:57:34 PM ---If any of the tubes take notion to spontaneously fail what happens to the solid components in the signal path down stream from them.
Are drivers in the output stage protected and are there modern equivalents to them available.
Scotty

--- End quote ---
Judiciously placed fuses will protect the important parts and pieces.  I am using all modern tubes. NOS is too expensive and very difficult to maintain SQ from device to device.

Edit:  At 72 my ears are past “prime time”.  Being able to get matched quads for much less than the cost of a single NOS tube.  A single NOS Genalex Gold Lion KT77 is $270.00 from Brent Jesse.  I bought a matched quad from Antique Electronics Supply for $180.00 during a 10% off sale.  When I checked them on my Heathkit tube tester (newly rebuilt with modern parts) they were within 2%.

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