by Alastair Reynolds » Mon Jul 22, 2013 10:06 pm
Ah, early Eventide devices, tricky little buggers to keep going as many of the chips have been obsolete for up to 20 years and as such command big prices. The 10 bit A/D - D/A devices for instance. Because of the extremely high cost of RAM in the early days ,Eventide (and others) used to use compansion techniques,dbx style, to reduce the dynamic range and hence bit depth prior to the delay stages.they used a similar technique in broadcast delays.I have old 632 mono 7 second delays that are 11 bit with dbx compansion for instance.Also some of the 910, 949 and other early delays used a lot of original 74XX series TTL logic, whilst not as rare as the DTL chips found in early Ampex machines like the AG440 or MM1100 they are still getting harder to find and some of the newer HS or HC series just don't quite do it right. The H3000 is a 16 Bit stereo full bandwidth device and chips are more common.They're still a great toy and as Chris points out, more affordable.If you do venture down the vintage path, try and find a second one to keep for bits.That's what I did with a H949 to get one working one and I keep my eyes open for a second 910 as I'm scared mine will stop one day . Second hand BD955 delay lines are good for A/D/A and RAM sourcing and BD980 use common DSP and A/D to the H3000.
My favorite H3000 is the H3000 KS (kitchen sink) it has the Broadcast board,the sampler board ,Studio,Studio Enhanced and Mod factory roms. One thing to watch on the 3000 is the transformers used to get real hot.make sure it has good ventilation. That's most of what I remember from my Syntec days in the early 90s working on these.
Alastair Reynolds
Broadcast Radio Engineer
Master of the Dark Arts (Broadcast)