On Wed, 20 Sep 2023, Van Snyder wrote:
I wonder if Susan Vigor has 727s with her 7094? Probably not.
That would be 729 drives (the transistorized successor of the 727).
We now have the 727 here (a 727 model III, built in 1957). It is complete
and in a very good shape. It only needs some norma
> On Oct 13, 2023, at 4:41 AM, Christian Corti via cctalk
> wrote:
>
> ...
> And the interesting part will be to build the DC power supply for the many
> voltages (-270V, -130V, -60V, +140V, +270V) and the heater supply.
A good source for information on how to do that would be an older edit
> On 10/13/2023 8:56 AM CDT Paul Koning via cctalk
> wrote:
>
>
> > On Oct 13, 2023, at 4:41 AM, Christian Corti via cctalk
> > wrote:
> >
> > ...
> > And the interesting part will be to build the DC power supply for the many
> > voltages (-270V, -130V, -60V, +140V, +270V) and the heater
The valve audio afficionados / suppliers also offer both wisdom and components,
e.g.
https://skillbank.co.uk/psu/ and many other sites / blogs
https://www.amazon.co.uk/Designing-Power-Supplies-Amplifiers-Second/dp/0956154549
https://shop.elsevier.com/books/valve-amplifiers/jones/978-0-08-096640
> On Oct 13, 2023, at 1:07 PM, Martin Bishop
> wrote:
>
> The valve audio afficionados / suppliers also offer both wisdom and
> components, e.g.
>
> https://skillbank.co.uk/psu/ and many other sites / blogs
>
> https://www.amazon.co.uk/Designing-Power-Supplies-Amplifiers-Second/dp/09561545
On 10/13/23 10:07, Martin Bishop via cctalk wrote:
> Regulation is typically effected by a high voltage N-fet or similar device
> see e.g.
> - https://www.microchip.com/en-us/product/lnd150# etc etc
> - https://www.ti.com/lit/pdf/snva020 etc etc
What, no violet-glow voltage regulator tubes (e.g.
The cost of implementing a linear regulator will be modest, measured in £s
rather than 10's for the components. Much of the actual cost will be in the
pin board layout; FWIW I have found 3 mm PTFE sheet, drilled as required and
fitted with crimp castle posts works nicely.
One merit of (wide ra
On 10/13/23 12:07, Martin Bishop via cctalk wrote:
The valve audio afficionados / suppliers also offer both wisdom and components,
e.g.
Ages ago I bought a Potter plug-compatible 9-track tape
drive from a surplus shop. It was designed as a 24xx
compatible drive. I was used to Pertec unformat
