@astolfor … You are quite right in seeking a better quality 6h30 , I would encourage you to acquire some pre 1990 production Reflector Corp 6h30 DR
they are relatively expensive compared to new production Sovtek and are becoming increasingly rare with a few unscrupulous individuals particularly on Ebay
listing Sovtek’s as NOS DR’s … Caveat emptor , however once obtained and inserted into your equipment you will realise how hard and sterile sounding the Sovteks are in comparison.
This guide should be of some assistance in discerning genuine Reflector DR’s