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<\/p>\nOne of the nicest looking 1983 amps in silver and black eh? Liked to have kept this...<\/p>\n
Nothing wrong really, bit noisy - caps etc. Subsonic buttons makes loud pop - cleaned pots\/switches etc. Has a micro controlled preheat function:<\/p>\n
<\/p>\n
54Vpp = 27Vp =-\u00a0 19V RMS<\/p>\n
P = V^2\/ R = 19 x 19 \/ 8 ohm = 45W<\/p>\n
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<\/p>\n
![\"\"](\"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-content\/uploads\/2020\/08\/specs-1.png\")
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<\/p>\n
All inputs work - tested the phono also at low phono level out - seems RIAA amp curve generates a bassier response than std ins?<\/p>\n
The THD figures for no load resistor from Allan at w2aew YT site are:<\/p>\n
![\"\"](\"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-content\/uploads\/2020\/08\/Calx-1-1024x640.png\")
![\"\"](\"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-content\/uploads\/2020\/08\/IMG_20200901_181120444-1024x576.jpg\")
<\/p>\n
Only 2nd harmonic dBc avg dV = -42.8 dB from the Fundamental, so...<\/p>\n
10^ (-42.8\/10) = 0.000052481<\/p>\n
Sum of V2..V3... = 0.000052481<\/p>\n
SQRT of 0.000052481 = 0.00724436<\/p>\n
THD = 0.00724436 x 100% = 0.72 THD at volume 6 or approx 1\/2 full volume distortion - but way more than the rated 1\/2 power into 8 ohms of 0.003 ...?<\/p>\n","protected":false},"excerpt":{"rendered":"
One of the nicest looking 1983 amps in silver and black eh? Liked to have kept this... Nothing wrong really, bit noisy - caps etc. Subsonic buttons makes loud pop - cleaned pots\/switches etc. Has a micro controlled preheat function: 54Vpp = 27Vp =-\u00a0 19V RMS P = V^2\/ R = 19 x 19 \/ ... Technics SU V303 + THD<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-9467","post","type-post","status-publish","format-standard","hentry","category-uncategorised"],"_links":{"self":[{"href":"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-json\/wp\/v2\/posts\/9467","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-json\/wp\/v2\/comments?post=9467"}],"version-history":[{"count":13,"href":"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-json\/wp\/v2\/posts\/9467\/revisions"}],"predecessor-version":[{"id":9685,"href":"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-json\/wp\/v2\/posts\/9467\/revisions\/9685"}],"wp:attachment":[{"href":"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-json\/wp\/v2\/media?parent=9467"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-json\/wp\/v2\/categories?post=9467"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/stevepedwards.today\/ElectronicsStuff\/wp-json\/wp\/v2\/tags?post=9467"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}