UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Rogers Ravensbrook series2 amp. Before attempting a capacitor replacement.

Radio Wrangler · 9th Jul 2020, 6:21 am

I was surprised that if an interstage transformer was used in a transistor amplifier, the opportunity wasn't taken to use a significant step-down ratio (voltage) in the transformer and to drive the output transistors in common-base mode. There's an advantage in linearity and bandwidth.

Stage gain would have been less, so I suppose the cost of more stages killed it.

David

9th Jul 2020, 6:21 am	#19
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,876	Re: Rogers Ravensbrook series2 amp. Before attempting a capacitor replacement. I was surprised that if an interstage transformer was used in a transistor amplifier, the opportunity wasn't taken to use a significant step-down ratio (voltage) in the transformer and to drive the output transistors in common-base mode. There's an advantage in linearity and bandwidth. Stage gain would have been less, so I suppose the cost of more stages killed it. David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done