Transformer with 2 secondaries connected to 2 rectifiers powering different grounding devices

Hello. I have an old transformer with 2 separate secondary windings - 32V-0V and 14V-0V. I would like to connect to both of these windings 2 separate ractifiers, of which first would power device with positive ground (amplifier) and second would power device with negative ground (tape recorder).

The thing is that I want to connect audio inputs and outputs of recorder and amplifier. So I want to connect positive ground of amp with negative ground of magnetophone.

Can I use for this 2 separate secondary windings of my transformer, or I have to use separate transformers for both devices?
 
I connected tape recorder to separate winding on same transformer as amp is connected too and connected recorder audio output to amp input and it works, the amp is aplifying music from recorder, however I think that current flow in my (transistor) amp is slightly disrupted, because audio source switch started make crackling sound with strange silent momentary noises when switching the source.

14V-0V secondary winding (which I use to power recorder) powers only bulb in amp and is not connected to ground of amp or anywhere else.

Probably I should buy new 14V transformer or prevent old one from loud buzzing and hum.

Or I missed some connection between recorder powering secondary winding and amp.
 
I connected tape recorder to separate winding on same transformer as amp is connected too and connected recorder audio output to amp input and it works, the amp is aplifying music from recorder, however I think that current flow in my (transistor) amp is slightly disrupted, because audio source switch started make crackling sound with strange silent momentary noises when switching the source.

14V-0V secondary winding (which I use to power recorder) powers only bulb in amp and is not connected to ground of amp or anywhere else.

Probably I should buy new 14V transformer or prevent old one from loud buzzing and hum.

Or I missed some connection between recorder powering secondary winding and amp.
Seems like a coupling capacitor before the switch is leaking DC.