UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Chinese 1A2 Super Regenerative FM radio kit

VT FUSE · 4th Nov 2017, 2:19 pm

To my my eyes,the circuit is not a superregenerative.
The 1A2/1R5/DK91 valves struggled over 10 MHz.

In 1949 Sylvania introduced the 1L6 "hotrod" version of the 1R5/DK91 for use by Zenith in the Transcontinental receiver that covered up to 30MHz (just,with an 1L6 testing 100%)

I think the Chinese 1A2 kit is doomed to fail,it may however be a good source for 50mA 1R5/DK91 replacements since these are starting to become scarcer.

Neil mentions a different kit based on EF95 or its eastern Bloc equivalents.
The EF95 is a really good valve into VHF well above broadcast bands as most already know.

4th Nov 2017, 2:19 pm	#33
VT FUSE Hexode Join Date: Aug 2010 Location: Malvern, Worcestershire, UK. Posts: 347	Re: Chinese 1A2 Super Regenerative FM radio kit To my my eyes,the circuit is not a superregenerative. The 1A2/1R5/DK91 valves struggled over 10 MHz. In 1949 Sylvania introduced the 1L6 "hotrod" version of the 1R5/DK91 for use by Zenith in the Transcontinental receiver that covered up to 30MHz (just,with an 1L6 testing 100%) I think the Chinese 1A2 kit is doomed to fail,it may however be a good source for 50mA 1R5/DK91 replacements since these are starting to become scarcer. Neil mentions a different kit based on EF95 or its eastern Bloc equivalents. The EF95 is a really good valve into VHF well above broadcast bands as most already know.