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discrete amps

Dynahi

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front pic pic
pic pic
800x600 52kB
800x600 51kB
800x600 41kB
800x600 43kB
frontpanel by Frontpanelexpress.com
Enclosure from Schuro.de
rear pic pic 800x600 45kB
800x600 60kB
rearpanel by Frontpanelexpress.com
inner side chrome plated to conduct protective earth
inside pic pic 800x600 85kB
800x600 114kB
0.45K/W heatsinks
Avel-Lindberg encapsuled toroidal transformer
Alps RK27 blue velvet volume pot
Bulgin-like 2x2 pole toggle switch
djgardner Dynalo / Dynahi page

 

β22

pic pic frontpanel by Frontpanelexpress.com
Enclosure from Schuro.de
pic pic
pic pic pic
pic pic pic β22 amp boards biased to200mA
polycarbonate / polyamide screws, washers, nuts and standoffs for electrically isolated mounting
all transistors are matched
electrolytic caps are Panasonic FM/FC, all other are high quality film caps (no ceramic caps used)
ε12 mute delay and offset protection from AMB.org
pic pic Alps RK27 50k blue velvet volume pot
acrylic insert and panel mounting plate, insert lighted by ultrabright LEDs
pic pic pic σ22 PSU from AMB.org
potted and shielded toroidal transformer with additional shield between primary and secondary winding, 2x 30V
earth connected to the case through a ground loop braker
β22 pages at AMB.org

 

Cavalli-Kan Kumisa-III

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pic pic pic frontpanel by Frontpanelexpress.com
Hammond 1455Q2202BK enclosure
pic pic pic Alps RK27 50k blue velvet volume potentiometer
30VA 2x15V toroidal transformer
pic pic pic electrolytic capacitors: Panasonic FC / FM
smaller capacitors: boxed film (Wima FKP / MKS / FKS / MKT)
output transistors: Toshiba 2sc3422 + 2sa1359, biased to 40mA
output transistors mounted electrically isolated by polyamid screws to bottom of the case
Kumisa III pages at AMB.org
build-related discussions at headwize.com

 

Dynalo

preview comments
pic pic front- and rearpanel by Frontpanelexpress.com
pic pic
pic pic toroidal transformer, Dynalo PSU, Alps Blue Velvet Volume Pot
Panasonic FM electrolytic caps
Wima MKP and Intertechnik Q4 polypropylene film caps
silvered mica compensation caps
gain set to 12 by 0.1% Vishay CMF55-143 resistors
2sj109 / 2sk389 / 2sa1015 / 2sc1815 transistors
pic pic illuminated volume knob, headphone jack integrated into a window
djgardner Dynalo / Dynahi page

 

Dynalo

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front pic 800x600
108 kB
by Frontpanelexpress.com
board pic 800x600
135 kB
design by Dr. Kevin Gilmore
2sj109 / 2sk389 / 2sa1015 / 2sc1815
djgardner Dynalo / Dynahi page

 

Dynalo (mod)

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front pic 800x600
101 kB
by Frontpanelexpress.com
board pic 800x600
143 kB
design by Dr. Kevin Gilmore
used transistors: 2sj109 / 2sk389 / sb647 / sd667 (=sc1627a)
rear pic 800x600
99 kB
by Frontpanelexpress.com
djgardner Dynalo / Dynahi page

 

Elektor discrete

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front 800x600
? kB
built somewhere in the 90s, pics soon to come