Rare Radford mono amps & speakers

[Tony L]

I don’t know anything about these other than I didn’t realise they even existed. They look like they might be a mono version of the STA25 in that they are a pair of EL34s and what looks like solid state rectification (I can’t see a rectifier tube anywhere anyway). Huge mains transformer! Someone go buy them quick as I want to read a thread about them! https://www.ebay.co.uk/itm/Radford-...d=link&campid=5338728743&toolid=20001&mkevt=1

 

[Johnjo]

Think this is a similar pair showing the rear connections.

Believe they were for studio use as the have choice of XLR or single ended input with input gain trim and some sort of filter (subsonic?) which can be switched in/out.

https://www.flickr.com/photos/rvhifi/7169043592/in/photostream/

 

[Johnjo]

They are mentioned here from 1962 as a modified MA-25 for BBC use with KEFs.

 

[Johnjo]

Scroll to the bottom of the page, picture of the amp with KEF LS5/1A

https://m.review33.com/forum_msg.ph...ic=78110527211332&start=120&sort=1&number=295

 

[Johnjo]

And another mention here describing the filter for flattening the speaker’s response

http://freecashmachinemoney.blogspot.com/2011/06/radford-electronics.html

 

[lawrence001]

Has the trim pot replaced the impedance selector? I think I'd rather have the latter.

 

[Johnjo]

Has the trim pot replaced the impedance selector? I think I'd rather have the latter.

Good spotting!