UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

beery · 14th Mar 2019, 11:14 am

Hi Adrian,
that's a very nice set and one that was once on my wish list.
I quite like Sobell sets. They are basic and made down to a price, but can give good results.
The biggest unknown will be the Mazda CRM92 CRT.
The set used a metal rectifier which won't put up with the current needed to re-form the old HT smoothing caps. Best to re-form these caps first before powering the set. The metal rectifier might still be tired, so be prepared to fit a 1N4007 and a series resistor in place of the original rectifier.

I think I have the diagram in an early Newnes book. I will have a look tonight and scan it in.

Good luck with the set.
Cheers
Andy

14th Mar 2019, 11:14 am	#4
beery Heptode Join Date: Jun 2006 Location: Ware, Hertfordshire, UK. Posts: 988	Re: Sobell T91 Hi Adrian, that's a very nice set and one that was once on my wish list. I quite like Sobell sets. They are basic and made down to a price, but can give good results. The biggest unknown will be the Mazda CRM92 CRT. The set used a metal rectifier which won't put up with the current needed to re-form the old HT smoothing caps. Best to re-form these caps first before powering the set. The metal rectifier might still be tired, so be prepared to fit a 1N4007 and a series resistor in place of the original rectifier. I think I have the diagram in an early Newnes book. I will have a look tonight and scan it in. Good luck with the set. Cheers Andy __________________ www.youtube.com/user/andyvalve100