[TenTec] 707 wiring

[Bob McGraw K4TAX]

Thank you for correcting my error in generalization.

73

Bob, K4TAX


On 10/12/2019 11:37 PM, Jim Brown wrote:
> On 10/12/2019 7:04 PM, Bob McGraw K4TAX wrote:
>> like most all dynamics, exhibit noticeable proximity effect.
>
> Proximity effect is a characteristic of CARDIOID mics, specifically 
> single-D cardioid mics). It has NOTHING to do with whether the mic is 
> a dynamic or a capacitor (true condenser or electret). A cardioid mic 
> has a pattern similar to a 2-el Yagi, but in three dimensions.
>
> Al Kahn, the founder of Ten Tec, also founded ElectroVoice with Lou 
> Burroughs in the '30s. When Lou wanted to retire, they sold the 
> company, and Al took his share to start Ten Tec, across the street 
> from EV's factory in Sevierville where they built microphones, among 
> other things.
>
> One of those mics was the 666, also known in the broadcast world as 
> the "Buchannon Hammer," because Lou demonstrated its ruggedness by 
> using it to pound a nail and EV's management was in Buchannon, MI. 
> That mic was their first "Variable-D" mic. Single-D cardioids work by 
> interference of sound arriving at the front and a single rear port, 
> wavelength effects create the pronounced bass boost for very close 
> sound sources (the mouth, or a musical instrument) called proximity 
> effect. Variable-D mics overcame this limitation,  with additional 
> rear openings providing very little bass boost. Current production 
> variable-D mics are the EV RE16, RE18, RE20, RE320, and RE-27N/D. I 
> don't know if Shure still makes theirs, the SM53 and SM54. AKG used to 
> make a D224. I still own a D224 and several RE16s and RE20s. All 
> variable-D mics are dynamics.
>
> 73, Jim K9YC
>
>
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