MARINLAW
Vintage is Bliss
In 1987 the V45A V55A and V65A were introduced ( these all SVI400* current drive setup same as the V40/50/60) power output was up over the predecessors as minor refinements were done and larger power transformers were used.
The V85A carried over unchanged
1988 saw radical revision of the V series amp. The SVI4003 and SVI4004 power ic was retrenched in favour of a discrete wheatstone setup, which saw in the SVI320* series power IC rolled out. The all new lineup was the V450 V550 and V650.
Of interest here is where cutting costs on heatsinks become a fork in the road.
The V660 running a SVI3205 could happily supply 2x 140W into 4 ohm, where in the later V78/V98(Z780/Z980 all used the same SVI3205 which was rated to 110W into 8 ohms only ( one only has to see the heatsink difference in the V660 and a V98 to get this)
Also the V85A was retired and replaced with the again discrete output V90D. The big difference here was Digital Inputs ( fiber optic and coaxial) with an onboard 18 bit D/A converter. Power out was on par with the V85A
The cheaper V78/V98(Z780/Z980 came out mainly bought as part of a system)
1989 saw in revised models V460 V560 and V660 with the V90D unchanged.
1990/91 again small changes with V470 V570 and V670 revision and power supplies being the main changes. (G50 and G70 amps took over from the V78/98)
1992 this daw in the VX series VX500 600 700 and the monster VX820. At this point the SVI series were replaced with those awful BC power modules.
From hereon in it simply got cheaper as the march of the BPC invaded the once serene offerings. Later models like the VX920 and their pre and power combos still carried on till the mid 90s.
So my su_v650 is still a good amp . Yeah still run it