Hot dog, jumping frog Albuquerque?
Here are a original Lambda Nova Signature:
Theses are not modified just repaired. Given the age of the LNS the headband get brittle and breaks in the middle usually. The only option is to replace it with another Lambda headband at the original one marked LNS is no longer available as a spare part. So long as the ear capsules have signature in red they are LNS. However there is no way of knowing without checking the drivers if they have been replaced too.
There is also the later signatures which I think from memory have gold lettering.
No only the Lambda Nova Signature and the Lambda Nova Classic has a gold coloured outer ring. The Lambda Signature driver looks normaly outside like the Lambda Professional driver with white cotton dust protector, later versions have a black ring with transparent film dust protector.
I'm thinking of getting either an SRM-323S or SRM-727II to pair with my SR-404 headphones. In the future I hope to get a pair of SR-007 MK2 and wonder if the SRM-323S will provide enough power. The SRM-727II produce 450vrms but having read through as many posts and reviews I could find I'm not sure which of these two amplifiers produces the best overall sound quality with the SR-404s and has the potential to adequately power the more demanding SR-007 MK2s. I've upgraded recently from Basic System II.
Thanks in advance for any comments.