Question/help with tube rectified TW

[jlatrace]

I am beginning my Express trainwreck and am using an extra JTM45 chassis. I am modeling my layout after the pics of Paul Ruby's chassis except that I plan to build mine using a tube rectifier.

My question is:
Do I need 80uf rectification at stage 1 when not using ss rectifiers? If not, do you agree that something like 40uf or 50uf be suitable for filtering the ripple from a tube rectifier?

Thanks in advance. I have been studying this site for some time and started my build last weekend.

[El_Martin]

Hi!

Tube rectifiers have a maximum capacitive load. It's around 50 uF for a single GZ34 for example.
Sound/feel of amp will change. CLC filtering yields less hum w. given Cs.
Again: sound will change.

If this is your first TW, I'd recommend staying close to original layouts and schematic.

Ciao
Martin

[jlatrace]

Thanks for the reply. This is my first TW but not my first build. I appreciate your advice to stay traditional, but since I already have the parts and like tweaking, I am forging ahead.

What I understand from your reply is that there are limited (if any) benefits from using filter values greater than 50uf when filtering a GZ34. I take that to mean that my gut feel that 40uf (maybe even 32uf) is an acceptable value to use as a starting place, subject to tweaking.

My research on this site tells me that a JTM style layout works if you use a good ground/layout approach. The approach I use seems to be consistent with the approach outlined in posts by Paul Ruby, who I understand is experienced in building TW's in a marshall style chassis. I'll let you know how it turmns out.

Wish me luck and thanks again for the advice and answers.