Tag Archives: Tube

Dynaco / Dynakit Stereo 70 Tube Amplifier

17 Dec


Dynaco / Dynakit Stereo 70 Tube Amplifier


H.H. Scott Model 280 Amplifier

12 Oct

H.H. Scott Model 280


H.H Scott Model 280 Laboratory Amplifier  (1958)

This amplifier is for sale:   $1000 + shipping

11 Tubes: (12AX7 x 3)  (EL34 x 4) 6BX7 6AL5 (5U4 x 2)

Dimensions (WHD) 18 x 6.5 x 13 inch
Scott Amplifier Model 280. 80 watts power output, 12-60000Hz, 0,5% THD
45 lb 0 oz (45 lb) / 20.430 kg

This amplifier is for sale:   $1000 + shipping


Ampex 6973 Stereo Tube Amplifier

7 Jan

Ampex Stereo Tube Amplifier

Ampex 6973 Stereo Tube Amplifier

This Ampex tube amplifier was originally in an Ampex stereo console.  It uses 4 6973 output tubes, and 2 7199 driver tubes.   Output is somewhere is about 15 watts per channel.

Check out the video of this amp in action after the break.


Mcintosh MC-240 Stereo Tube Amplifier

4 Oct

Mcintosh MC-240 Tube Amplifier

Image Credit: LotLogginon eBay


Mcintosh MC-240 Stereo Tube Amplifier (1960-1969 MSRP 288 USD)

The Mcintosh MC240 is a 40 watts per channel tube amplifier first produced by Mcintosh Labs in 1960.  It uses 4 6l6GC tubes to achieve it's rated output, and a mix of 12ax7, 12au7 and 12bh7 tubes in the signal path.   The MC240 has a unique place in audio history, it was used by Brian Wilson of The Beach Boys to master Pet Sounds in 1966, one of the most famous albums in rock & roll history.


ELECTRICAL: 40w/ch stereo, 80w mono. Response 16-40kHz (+0 -0.1dB). Distortion 0.5%. Noise & hum -90dB. Output impedance 4, 8, 16, 125 and 600 ohms. 600 ohm center tap internally grounded. (2, 4, 8, 16 and 32 ohms in mono). Output voltages 25 (isolated), 70.7 (one side grounded) and 140V (center tap grounded). Internal impedance less than 10% of rated impedance. Input impedance 250k. Input sensitivity: 0.5V (in mono or twin amp). 2.0V in stereo.

MECHANICAL: Chrome chassis. Line output octal socket for higher impedances and voltages. Barrier strips for 4, 8 and 16 ohms. Audio inputs: stereo, twin and mono. Gain controls: twin amp, balance and mono. Input switch: stereo, twin amp or mono. Can be used for 80w mono. Line voltage switch: 117 or 125V.

TUBES: 4-6L6GC/7027A output, 3-12AX7, 2-12AU7, 2-12BH7 Solid state rectifier.

Size 8"H, 10-3/4"W and 17-1/4"D. Weight 56 lb. Sold from 1960-1969.