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

Skywave · 10th Oct 2019, 1:04 am

In the photos, I see three valves. The smaller valve must be the twin anode rectifier. But how is the stabilization achieved? Usually, there is a neon-type valve for that - such as a VR150/30 (a.k.a. 0D3), an OB2 or an OA2. But I don't see one. There has to be some sort of reference voltage in the design somewhere, no?
Plus, are the two 12E1 valves wired in parallel, or is one acting as the error amplifier?

Just curious.

AL.

10th Oct 2019, 1:04 am	#9
Skywave Rest in Peace Join Date: Jun 2006 Location: Chard, South Somerset, UK. Posts: 7,457	Re: Solartron SRS153 information In the photos, I see three valves. The smaller valve must be the twin anode rectifier. But how is the stabilization achieved? Usually, there is a neon-type valve for that - such as a VR150/30 (a.k.a. 0D3), an OB2 or an OA2. But I don't see one. There has to be some sort of reference voltage in the design somewhere, no? Plus, are the two 12E1 valves wired in parallel, or is one acting as the error amplifier? Just curious. AL.