Hi all, new to this forum and thought you guys / girls might be able to help with this. I am interested in a range of valves a few of us are talking about. I think they might have been Brimar based originally (from the number style) but my ususal sources on info have little if any info on them. I have tried looking at other voltages and a wide range of books but most of my best data is US based and there is little if any data out there. 13D2 I have tracked down as a Brimar number for SQ 6SN7 (ECC33?) 13D3 CV4068? seems to be a ECC32 on a B9A base? 13D4, 13D5, 13D6, 13D7, 13D8, I am struggling with info despite a decent valve data collection. Everyone tells me the 13d5 is an exact eqivalentof the ECC82 but no one has any data to support this. Can anyone help? It has been bugging me for ages!! Many thanks Nic