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In the Forum: Melquiades Amplifier
In the Thread: Valve Preamplifier for Macondo/DSET
Post Subject: 801A preampPosted by N-set on: 8/4/2023
After eons of construction, I've finally completed my version of the 801A premap, based on Ale Moglia /Bartola Valves design with his Gyrator anode loads, SiC bias and Rod Coleman filament supplies. 6 inputs, switched by an Elma switch and Dave Slagle / Intactaudio TVC on the output to better drive the 5m long IC cables to B2. I'm sorry I'm too lazy to upload the pics, you can find some here: https://www.facebook.com/groups/164921830213087/posts/6808017412570129/
Expectedly, it is a night and day from my previous Yamaha C2 that was temporarily doing the job. The pre is still breaking-in, missing a proper power cord, etc
but man it makes magic! It also shows more accurately how Dannoys work, uncovered some problems with a bass in my space, but that is a separate subject.
PS is Romy-style with 3300uF caps. I made my life harder being too lazy to add a shorting resistor on power down so have to wait about 10mins after switching the HV off for the caps to discharge. If anyone follows the design, do make that little effort.
There is a space in the chassis (and a ready PS) for a twin TDA1541A DAC I've been cooking simultaneously, hope to finish within a few eons.
Big thanks to Anthony for the inspiration and help!
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