Justin & Jerry's Hifi Blog

Quote:

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Originally Posted by Firebottle

The one problem with the valve output stage is that the HT voltage is only 75V, it is regulated which is good but it really could do with being higher to get the best out of any valve. The actual voltage across the valve is only 62V which only exacerbates the problem.

As it is only a buffer and is at a high signal level the regulation isn't necessary, so I removed it and simplified the filtering to achieve 90V across the valve.

:)

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Strangely (?), all of the valve buffer type arrangements I have come across don't run the valves very hot. Usually they aren't even hot to the touch, merely warm.
Is there a reason for that?

Jolida DACs come to mind. A few others as well.

Quote:

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Originally Posted by struth

oh, nice pic. thanks Alan...:)

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As I said but yeah a pic speaks a thousand words.

I'm going to be as nice as Jezzer so anyone who would like to try the Sylvania Gold Brand and Western Electric can do so if they ask nicely and have some credible forum rep - for free.

WE - yes please

Quote:

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Originally Posted by jandl100

WE - yes please

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But you don't have any credible forum rep.












Soz - no unobvious emoticons on a mobile in Tapatalk:D

No probs Jerry:)

I just want to try to see if I want to buy one.
Happy to pass on after a day to anyone else that meets Justin's approval.

Dunno if there is another member of jerrys rep tbh

Quote:

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Originally Posted by struth

Dunno if there is another member of jerrys rep tbh

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Nope.

I'll drop you a Gold Brand too Jerry. No accounting for systems and tastes!:)

So there's a Gold Brand still going for someone else to try.

https://youtu.be/gqSzDJGFCgI

OKey doke.

And postie has just delivered a GE JAN 5670W. :)

:popcorn:

Too many valves, so little time.