UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - The Ever-Ready experimental transistor TV set.

FERNSEH · 31st Mar 2020, 5:37 pm

Kalee20 wrote: "Also interesting that they used the silicon OC200 in the frame timebase - I wonder why, most others being germanium?"

Hi Kalee, There is a Mullard silicon transistor in the power supply circuit, an OC203.
The OC200 was first introduced in 1960, the developer was Mullard.
Remember reading about the new transistor in the Wireless World.
I'm busy tracing out the circuit of the power supply and will post up a circuit diagram in due course. It's not a simple series regulator. Something much more interesting.
From the Radiomuseum: https://www.radiomuseum.org/tubes/tube_oc200.html

DFWB.

31st Mar 2020, 5:37 pm	#12
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: The Ever-Ready experimental transistor TV set. Kalee20 wrote: "Also interesting that they used the silicon OC200 in the frame timebase - I wonder why, most others being germanium?" Hi Kalee, There is a Mullard silicon transistor in the power supply circuit, an OC203. The OC200 was first introduced in 1960, the developer was Mullard. Remember reading about the new transistor in the Wireless World. I'm busy tracing out the circuit of the power supply and will post up a circuit diagram in due course. It's not a simple series regulator. Something much more interesting. From the Radiomuseum: https://www.radiomuseum.org/tubes/tube_oc200.html DFWB.