First Tube Amplifier build but after deciding on the "Jonokuchi" destop amp as a first build I haven't been able to find any recent updates form other builders, I have some questions to be answered and hopefully will find some help here - I'm looking forward to getting the PCB soon so I can get started.
First question is about the #6-32 x 1/4" standoffs for supporting the PCB, Should the standoffs be metal (which I'm assuming would ground the PCB to the chassis) or Nylon to prevent grounding the PCB ?
Second - Would a pair of Sylvania GE 6EM7 tubes be a suitable replacement for the 13EM7 13v filament tubes ? I haven't been able to find many 13EM7 tubes and was wondering if there are any tubes that could be used as replacements ?
Any input on better quality replacements for C5 and C6 - 0.1uF 630V coupling capacitors ? I've been looking at the Obbligato Gold Premium Capacitors
Last - I'm thinking about a minimalist chassis design with a cleaner look, Would it be possible to conceal the three transformers inside the chassis if kept away or shielded from the PCB ?
Also for anyone who may be building this project soon here's one update for now on the Jonokuchi BOM as this part is no longer available from Mouser -
D1 - Fairchild Bridge rectifier 2A 50V - 3N253 (Mouser Part # 512-3N253) is no longer available so I'm using the following in it's place
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|Manufacturer Part #:||
Bridge Rectifiers 2.0 Amp 50 Volt