Hi,
I have built several tube amps using turret boards and axial components. This will be the first amp build using a PCB and I'm making the switch to radial capacitors.
While I am waiting for the Princeton Reverb PCB to arrive here in Australia, I would like to order the passive components.
What is the hole spacing (Lead Space) on the AA Electronics PCBs?
I am thinking of using Rubicon filter caps eg: 450LLE22MEFC12.5X25
and Panasonic Metallized Polyester Film Caps eg: ECQ-E6103JFB
or using my existing stock of axial IC MPW Metallized Polypropylene Film Caps.
For resistors Metal Film .6 W Vishay and Metal oxide for the dropping resistors.
Does anyone have recommendations for brand & type Ceramic Disc Caps and Silver Mica?
What passive components are you using in your builds?
Regards,
Steve
Down the rabbit hole! I don't normally recommend Wikipedia as a source, but their page on ceramic capacitors is pretty good once you've scrolled down to the Applications and classes topic.
For ceramics, the dielectric makes a lot of difference in behavior. NP0 (CG or C0G) ceramics are the least likely to be microphonc, but are avaialbe only in very small cap values (and mostly surface mount). X7R are less tolerant of microphony, but are temperature tolerant and available in values commonly used in valve amps. And their are many others, all with advantages and disadvantages.
I've quit using Mallory 150's -- they're the old standard, but I think the new radial film caps are more stable. I particularly like the Panasonic polypropylene caps which are small and sound great. Of course everyone likes the Orange drop 715 series -- they sound great but are garish and fat.
Andrea's BOM is already there for you. It's a great starting point.