6H30 (1/2) vs 6GK5 in linestage

[euro21]

Here is the real life:
Noguchi 24k:600 (160H primary inductance) as a 801 (5k output impedance) line output transformer.

 

[WFCkeyman]

Thanks for all your comments! I decided to build 2 linestage based on these 2 tubes.

One with 6H30 Ultrapath and the 6GK5 would be using Bartola SF. And then do a comparison.

 

[WFCkeyman]

Here is the real life:
Noguchi 24k:600 (160H primary inductance) as a 801 (5k output impedance) line output transformer.

I guess source follower would be less compromise with 6GK5 but I am seeking 6K:600R OPT for the 6H30

 

[euro21]

At -about- 85V, -2.5V, 40mA the 6N30P (DR) output impedance below 1k, so 6k SE OT is OK ... if it have enough primary inductance.

 

[WFCkeyman]

At -about- 85V, -2.5V, 40mA the 6N30P (DR) output impedance below 1k, so 6k SE OT is OK ... if it have enough primary inductance.

Is this transformer suitable for ECC99 (1/2)??

 

[euro21]

ECC99 has 2k3 internal impedance, so any 10k (or greater) OT is perfect for it... if it has greater than 80H primary inductance.

If the inductance is lower, the LF bandwith -3dB point is creeps up.

p.s. Noguchi transformers are not cheap toys. :-(

 

[WFCkeyman]

Whether Noguchi transformers have anything for this purpose (ECC99)?