Seduction regulated heater supply.

[Dobs]

Suggestion here:

Why Bottlehead dont make another (i would call it PT-2) transformer based on the PT-1 with 2A on the 6.3v output as an option for those who wants to use tubes alternative like the 6n1p.

[Paul Joppa]

We do make such a transformer; it's called the PT-5 and is used in the Eros. It can supply 1.3 amps of regulated DC current for heaters, and 55mA of plate current at 275 volts, using a voltage doubler as is done in the Eros. The PT-5 runs are very low magnetic induction in order to maintain a low magnetic leakage field, so that it does not need the molyperm shield tape of the PT-1.

The PT-5 is much larger than the PT-1, and requires a large rectangular cutout on the chassis plate - I think it would be impractical to use it on the same chassis plate, which is why I have not suggested it before.

We did look at making a version of the Seduction with this power supply. It's quite attractive, but it would be the same cost as the Eros, which we feel is a bit better sounding circuit.

[Dobs]

Paul can you read reply #12, i need some precision on the 100ohm resistor.

[Paul Joppa]

ok,

If im correct, i will install one 100ohm resistor connected to ground at each output of the 6.3v of the transformer and keep the 3 1uf cap present on each socket as a start. If too much noise i can try to bias the heater.

And i read that you suggest to change the 1m resistor to 500k for the 6n1p to keep the RIAA more linear, right?
...

You are correct, in both cases.

[Dobs]

Does the 6h23n need to change the 1m resistor to 500k like the 6n1p?