[Milsurplus] British PYE receiver

[Ken Gordon]

In MY opinion, installing the transformer where you yqf3 chosen it will not cause induced 
hum, since the frequencies are so far apart. BUT, there may be other iseuses, such as 
grounding various bits in the vicinity which may cause hum issues.

All I can say is try it and see what happens.

Ken W7EKB

On 8 Jan 2024 at 1:49, Ray Fantini wrote:

> 
> Ok, so I am rebuilding a old WW2 British PYE receiver. Not a high
> performance communications receiver but a Broadcast radio. It´s a
> PYE 2 that originally had an external power supply and an external
> speaker. The PYE 3 had an internal speaker and I will be installing a
> new four inch speaker and making it look like a PYE 3 but also want to
> install an internal AC power supply. Fair amount of room on the
> chassis and want to keep the original filter choke because its so huge
> and ugly but the thing is I think I can mount the new power
> transformer on the chassis but the location I am looking at is within
> a couple inches of the tuning capacitor. The transformer has a
> magnetic shield but wanted to know if there were any issues in having
> the power transformer in close proximity to the main tuning capacitor?
> The audio output transformer and choke are already mounted on the top
> of the chassis and they are open frame design with no shield, but they
> are around six or seven inches away from the capacitor. Can the new
> transformer induce hum in the front end? Or will the shell of the
> transformer prevent this? Before anyone starts complaining about
> changing around this radio the PYE is not a uncommon radio and this
> will result in a functional AC powered Broadcast receiver all in one
> cabinet. Also I am using many period correct components like a
> rectifier tube and vintage capacitors that have been checked and are
> all solid components. Interesting foot note, think this radio was
> re-worked in the fifties because all the capacitors are good unlike
> some of the British R-1155 that I have worked on where every capacitor
> was open.  
> 
> Ray F/KA3EKH