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Posted new design: "Jonokuchi" destop amp - Page 4

post #46 of 48

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 

 

Mouser Part #:
625-2KBP005M-E4
Manufacturer Part #:

2KBP005M-E4/45

Manufacturer:

Vishay Semiconductors

Description:

Bridge Rectifiers 2.0 Amp 50 Volt

 

 

 

 

 

 

 

 

 

 


 

 
 
post #47 of 48

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 from 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 two updates for now on the Jonokuchi BOM as these parts are no longer available from Mouser - 

 

 

C1,C2 - 1uF 100V film cap 5mm LS  Wima (Mouser Part# 505-MKS21/100/10) using the following in it's place 

 

VISHAY-RODERSTEIN

MKP-1837 Metalized Polypropylene

Film Capacitor

 

http://www.partsconnexion.com/capacitor_film_visrod.html#14846

 

 

D1 - Fairchild Bridge rectifier 2A 50V - 3N253  (Mouser Part # 512-3N253) using the following in it's place 

 

Mouser Part #:
625-2KBP005M-E4
Manufacturer Part #:

2KBP005M-E4/45

Manufacturer:

Vishay Semiconductors

Description:

Bridge Rectifiers 2.0 Amp 50 Volt

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

 
 

 

post #48 of 48

I've got the PCB for this kit almost fully populated, waiting on tube sockets (got a couple of different styles to try) before cutting the top plate.  I've also left off the switches and jacks on the front edge, thinking of doing a slightly larger case so I'll need to adjust the spacing of the front controls.

 

I didn't realize until I started this post that this is kind of a necro-thread; anyone built one of these kits lately?

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