Here’s my latest Wikiloops Album:
I’ve compiled a list from information available on the internet that may help date a Hammond console (A-100, C3, B3, D-100, RT-3)
1958 – Vibrato line box changed from wood to metal
1960 – Side blocks change from wood to plastic
1961 – Pilot lamp added
1962 – Vibrato knob changed from smooth to ribbed (‘fluted’)
Mid-1962 – AO28 transformer colour change from silver to black
Spring 1964 – Start of using red caps
1965 – Hammond script changed from small to large with new logo
1965 – Foam replaces felt
1965 – Introduction of R/C (resistor/capacitor) networks to tones 37-48 to reduce hum and crosstalk
1969 – Drawbar plastic knob style change to have engraved tones
Additional information can be gleaned from the components in the organ. Speakers (A-100 series) are usually stamped with a production date; the same applies for tubes / valves as well as capacitors.
Here’s some information I found on the tubes / valves in Hammond consoles (A100-series, D100-series, B3, C3, RT3)
A0-28 pre-amp: 6X4, 12AX7/ECC83, 12AU7/ECC82, 12BH7, 6AU6 (2), 6C4 (2x)
A0-35 reverb-amp: 6X4, 12AX7/ECC83, 12AU7/ECC82, 12BH7, 6AU6 (2), 6C4 (2x)
A0-44 reverb-amp: 6CA4/EZ81, 6GW8/ECL86(2x)
A0-39 power-amp: 5U4GB, 12AX7/ECC83, 6BQ5/EL84/6P14 (2x)
An inside look at a Hammond tone generator. Shows the oiling system that uses cotton wicks, and explains and demonstrates the workings of the tone wheels.
Hammond Documentary by the BBC featuring Keith Emerson, Steve Winwood and Jimmy Smith
Jut added an Audioengine D1 to my setup. This makes such a difference, the sound quality is so much better than using either the Steinberg CI2+ headphone output, and it also leaves the output from my Macbook Pro in the dust. Granted, I’m using an AKG – K-701 which is notoriously tricky to drive, but this little DAC / Headphone amp does it really well.
Most of you will know that I am quite an active contributor to Wikiloops, which involves download mp3 tracks and adding additional stems, and I really had a hard time hearing the previously recorded tracks – with the Audioengine D1, this problem is now solved.
Only downside is the it takes only the small 1/8 ” mini plug size (3.5 mm), but with the appropriate adapter it will also drive headphones that use the larger 1/4” plug, like the AKG K-701.