DYNACO MARK III DYNACO ST70 KT88 6550 Dynakit Mark 3 Mono Block AMPLIFIER

	€		900
	$		977

Amplificador DYNACO MARK III mark3 KT88 6550 electro harmonix 

Description:

The Mark III uses a novel and simple circuit. A pentode voltage amplifier, with parameters adjusted for minimum distortion, is directly coupled to a cathodyne phase inverter. High frequency compensation is employed in a capacitive feedback loop, which corrects the inherent unbalance of this type of phase inverter. The inverter drives the output tubes which are operated with fixed bias. The connection of the output tubes includes a small percentage of screen loading which improves the regulation of the stage and makes it comparatively uncitical of load impedance. The impedance match and bias conditions utilized in the output stage provide minimum distortion operation over a very wide dynamic range. In addition, 20 dB of negative feedback lowers the distortion to an unmeasurable proportion at normal listening levels and to less than 1% IM at 60 watts output.

Phase compensation at both high and low frequencies is incorporated into the circuit arrangement to provide a wide margin of stability and to make construction uncritical. This feature of the design means that there is no tendency toward motorboating or oscillation under and conditions of use.

Specifications:

Power Output: 60 watts continuous(rms).

Intermodulation Distortion: Less than 1% at 60 watts; less than .5% below 50 watts. These figures apply for any conventional combination of test frequencies.

Response:

Power Response: 20 cps to 20,000 cps within 1 dB of 60 watts without exceeding 1% harmonic distortion over this range.

Square Wave Response: Essentially undistorted 20 cps to 20,000 cps on loudspeaker load.

Input Impedance: 500,000 ohms.

Sensitivity: 1.6 volts rms input for 60 watts output.

Hum and Noise: Better than 90 dB below rated output.

Damping Factor: 15.

Output Impedances: 4, 8, and 16 ohms (no restrapping required for changing output impedances).

Tubes: KT-88 (2)[early] / 6550 (2)[late], 6AN8, GZ-34.

Size: 9" by 9" by 6-3/4" high.

Weight: 28 pounds.

Designed by:

David Hafler, Ed Laurent

Year Introduced:

1957

Price:

$79.95 kit
$99.95 assembled

Comments:

The classic monoblock tube amplifier. As highly regarded today as it was when it first hit the streets. The target for hundreds of aftermarket modifications and amateur experimentation. Introduced in 1957. Thanks to Ned Carlson fromTriode Electronics for the scan of the classic review!

Amplificador monofonico Dynaco.
Visita mi previo Dynaco Pas III también en venta.
Tensión de 117v
Los apliques de acero inoxidable simplemente se ponen encima sin modificar el chasis de las etapas.
Estas pujando por dos etapas monofonicas Dynaco
Perfecto estado de funcionamiento.
No tiene ruidos,chasquidos,chisporrotea ni nada parecido.
Completo con válvulas y tapas de protección.
Compras lo que aparece en la foto,incluidas las protecciones de inoxidable de la placa de condensadores.
Los condensadores y partes de desgaste están reemplazados por unos nuevos.Los condensadores electrolíticos tambien.
Se incluyen las placas de condensadores antiguas en perfecto estado de funcionamiento cuando se cambiaron por unas nuevas.



Dynaco mono amplifier.


He visits my previous Dynaco Pas III also in sale in another article.
Tension of 117v
 The light-fittings of stainless steel simply put above without modifying the chassis of the stages.
These bidding for two monophonic stages Dynaco
Monophonic amplifier Dynaco.
 Perfect condition of functioning.
 It does not have noises, pops, chisporrotea not not similarly at all.
 I complete with valves and protection lids.
 You buy what appears in the photo, included the protections of stainless of the plate of condensers.
 The condensers and parts of wear are replaced by the new some. Electrolytic condensers also.
The ancient plates of condensers are included in mint condition of functioning when they changed for the new some.