On 2016-Nov-16, at 8:44 PM, Jon Elson wrote:
> On 11/16/2016 10:10 PM, drlegendre . wrote:
>> "Note the "tube audio" folks gravitate to that stuff and tend to cause
>> seriously sick prices, because tubes."
>> 
>> 
>> FYI - I've installed dozens of the new-production CE / Mallory caps, all of
>> them in the 350-525V range. Zero complaints, zero comebacks, in as long as
>> I've installed them. For those of us in that field, they're like a gift
>> from the gods.
>> 
> Vintage tube audio doesn't need to get involved, except for the old-style 
> twist-lock Mallory cap design.
> All the off-line switching supplies use either 250 V (120 supply only) or 
> 400+ (120/240 supply) capacitors as the main input filter. So, at least, 
> capacitors in that voltage range are STILL being made, and are in all 
> computers, TVs and other home appliances.  (Yes, I know the OP needed a 30 V 
> cap.)
> 
> So, some other tube gear replacement parts may be scarcer than hen's teeth, 
> but the HV caps are easily available.

(tending off-topic . . )

As long as one is being careful about the size (capacitance) of the 
replacements.
IME, I've found limited benefit in trying to use/source/scavenge 
switching-supply caps for tube gear.

The mains-side filter caps for switching supplies tend to be large in 
capacitance (100-200 and > uF), and typically are not suitable for replacing 
the ~ 8-40uF B+ filter caps in vintage tube electronics that have tube 
rectifiers. 

Maybe there are smaller ones in the smaller switching supplies around these 
days, I haven't looked at those recently.

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