Cool Old Kit You Never Heard Of

[User211]

The mains transformer does not appear to be shielded or shrouded with a mu-metal shield, so depends on the transformer core laminations not having any flux leakage. The transformer is however located distant from the electronics, so the effect of any flux leakage is minimised; although an additional magnetic shield between the transformer and the nearby valves wouldn't do any harm.

Rectification is provided by a pair of solid state diodes, rather than a double-diode valve, so putting the power supply in a separate enclosure would not offer any real benefit; it would just cost more.

What's your electronics background, Barry? Just curious.

[Marco]

Rectification is provided by a pair of solid state diodes, rather than a double-diode valve, so putting the power supply in a separate enclosure would not offer any real benefit; it would just cost more.

In your opinion. Experience tells me differently, as does that of Glenn Croft. My Croft preamp now has solid-state rectification, as opposed to originally a 6080 valve, and upgrading the PSU and putting it into a separate enclosure made a noticeable sonic improvement.

Carrying out this sort of modification can really make a difference *if* it's done properly by a qualified EE.

Marco.

[Barry]

What's your electronics background, Barry? Just curious.

Only what I was taught for my undergraduate degree in Physics. Did postgraduate work in Applied Mathematics and Theoretical Physics and later worked in the research centre for what was then the largest electronics company in the UK. My work there was the design of microwave components for radar and communications - somewhat removed from audio engineering.

My only experience with audio electronics has been in building valve and later solid-state power amplifiers, for my own use, and through that, learning about good practice when it comes to shielding etc.

[User211]

Only what I was taught for my undergraduate degree in Physics. Did postgraduate work in Applied Mathematics and Theoretical Physics and later worked in the research centre for what was then the largest electronics company in the UK. My work there was the design of microwave components for radar and communications - somewhat removed from audio engineering.

My only experience with audio electronics has been in building valve and later solid-state power amplifiers, for my own use, and through that, learning about good practice when it comes to shielding etc.

Respect level increased by a high order of magnitude