06-01-2017, 10:05 AM
Mike, all GP91 series cartridges are ceramic. The later SC version stopped these mono cartridges damaging the grooves of stereo records. See here for an explanation.
Older crystal cartridges usually have a much higher output than the later ceramic types and the BSR TC8H, in particular, had a very high output - thus the H suffix - capable of driving a UL84 directly, thus creating a series of cheaper one-valve record players.
I wouldn't expect to see a TC8H driving an ECL82, though. The TC8M (medium output) would be the usual choice. I don't have comparative information to hand but I would expect the TC8M to have a higher output than the GP91-1, though.
I'm wondering if the TC8H was fitted to overcome a low gain fault in the amplifier in the past? It might be worth more investigation.
Older crystal cartridges usually have a much higher output than the later ceramic types and the BSR TC8H, in particular, had a very high output - thus the H suffix - capable of driving a UL84 directly, thus creating a series of cheaper one-valve record players.
I wouldn't expect to see a TC8H driving an ECL82, though. The TC8M (medium output) would be the usual choice. I don't have comparative information to hand but I would expect the TC8M to have a higher output than the GP91-1, though.
I'm wondering if the TC8H was fitted to overcome a low gain fault in the amplifier in the past? It might be worth more investigation.
