I'm interested in the Arjen Helder MKIV preamp - but how does he account for bias if it is possible to use any 9 pin tube?
Seriously?? Find the Drawings for the George Wright designed /sold by Bottlehead 'Foreplay' preamp.. 2x 12ax's in triode
A Whole World More advanced than that Arjen lashup.
Used to be $99 for the Kit.
Now it's too many hundreds of $$ to buy (dunno Why? there are 'maybe' $75 worth of parts in it)
Shame really, It's a V good preamp, better than 95% of what's available, but the current pricings are imo just silly Greedy.
Do... try and hunt up a Schematic .. well worth the trouble.
I might scan my schematic.. if serious 🙂
A Whole World More advanced than that Arjen lashup.
Used to be $99 for the Kit.
Now it's too many hundreds of $$ to buy (dunno Why? there are 'maybe' $75 worth of parts in it)
Shame really, It's a V good preamp, better than 95% of what's available, but the current pricings are imo just silly Greedy.
Do... try and hunt up a Schematic .. well worth the trouble.
I might scan my schematic.. if serious 🙂
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