Modwright PH 9.0X Tube Rolling Question

@scm - I managed to get my hands on a NOS Mullard 5AR4 - boy what a transformational difference it made! Rich tonality, clean sound and wide sound stage. @theflattire  - the upgrade is worth the $. 

@pistha It`s amazing that one tube does makes that much difference.

Well worth the investment of both upgrades but changing out that Sovtek tube to a vintage type 5AR4 is transformative 👍

Maybe because changing from a 5R4 or the like to a 5AR4 will increase the DCV delivered to the tubes by 50V. That’s a big difference.

It’s interesting to me that Kristen at Modwright did not list the 5AR4 as an option (see above). Whereas Dan mentions the GZ34, which is a 5AR4 by another name. 

Correction: Kristen did list the GZ34 (5AR4). My error.

Kristen did mention that the 5AR4 has the lowest forward voltage drop - I assume it just means more output DC voltage. Presumably this makes it possible for the unit to deliver the full spectrum of audio frequencies and hence sounds more dynamic. I still badly want to try the RCA Double Getter 5R4GY - they are supposed to rival the WE 274Bs. But I am still concerned about the wide base of the 5RrGY tilting one of the ceramic resistors. I got an email from Mod saying the tilt is fine and I should ptobably trust them. But in all my years of using tube gear - never have I seen any component touch each other with the exception of shielded wires.  Still curious if others had similar issues with this particular tube rectification mod. Please share