12-09-2015, 08:07 PM
Very nice 
I especially like those resistors for vintage applications. Earlier today I was looking through my selection for some 15 ohm versions, but alas I shall have to buy some modern film types. For me, there's something about the choice of deep red for the background, along with the glossy finish, that make them especially easy to read, and highly attractive when in situ.
Surely some of the hiss will be caused by thermal noise in the input resistance? If it varies with the setting of the volume control, that's where I'd be looking - especially if it reaches a maximum before reducing as you get to the maximum. When designing for low noise in the solid-state world, anything over 2k is likely to generate more noise than is necessary. Therefore, 10k is the highest value for a volume pot that you'd ever see (max Zout being 2.5k if fed from a low-Z source).
I especially like those resistors for vintage applications. Earlier today I was looking through my selection for some 15 ohm versions, but alas I shall have to buy some modern film types. For me, there's something about the choice of deep red for the background, along with the glossy finish, that make them especially easy to read, and highly attractive when in situ.
Surely some of the hiss will be caused by thermal noise in the input resistance? If it varies with the setting of the volume control, that's where I'd be looking - especially if it reaches a maximum before reducing as you get to the maximum. When designing for low noise in the solid-state world, anything over 2k is likely to generate more noise than is necessary. Therefore, 10k is the highest value for a volume pot that you'd ever see (max Zout being 2.5k if fed from a low-Z source).
