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https://www.gearslutz.com/board/so-much-gear-so-little-time/464262-official-timeline-history-all-api-2520-variants.html

2520 history from Paul Wolff: 2520 Melville / Huntington / Datatronix

Melcor 1731

API 2520

API 2510

Jensen 918

Jensen 990

Hall SPA-690

Avedis 1122

BAE 2015

IC VF600

Scott Liebers:

SL-1731: Melcor

SL-2510: More reliable

SL-2520 Red Dot: Based off the original design [Huntington and Melville]

SL-2520 Blue Dot: Based off current iteration

SL-2520 Platinum Super Dot: CAPI exclusive, little faster slew rate than Red dot, has nice 2nd order harmonic content.

CAPI:

DT05

DT07

Gary Barnett:

gar918: 990 predecessor

gar1731: Melcor

gar2520: Classic 2520

garAM10: QuadEight

A1000

A2000

AM3

AM4

AM10

AM11

https://www.gearslutz.com/board/high-end/125942-quad-eight-amp-electrodyne-variances.html

https://eliaudioblog.wordpress.com/category/melcor/

Purple?

Whistle Rock Audio
ML2520: API 2520

ML918: Jensen JE-918

RED-25: SMT Huntington era AP2520

BLU-18: SMT JE-918

Louder Than Liftoff Rogue Five: API 2520