Jazzy_Pidjay
Well-known member
hi!!
Visibly the Blue Bottle have a design
very close to the G7 :
" The Bottle vacuum tube amplifier consists
of a classic common cathode circuit using a current
source for the plate load "
"The amplified signal is taken from the plate and
fet through a high-quality Hovland polypropylene
capacitor bypassed by a smaller value polystyrene capacitor"
Why they bypass the blocking cap ? in the Auricap
web site they really against the bypassing ?!
"The Bottle Microphone employs an EF86 pentode
vacuul tube connected in a triode mode. The third grid of
the EF86 is connected with a cathode and is grounded"
"The amplifier input is separated from the microphone capsule
with a capacitance consisting of two styroflex caps (one ten times
the value of the other) mounted on special Teflon Isolators"
what is the goal of the Teflon Isolators ?
"The BLUE hand-built Bottle microphone transformer is balanced
using a symmetrical two-bobbin design, with a transforming ratio
of 13:1. With this ratio, the microphone achieves a low output impedance
typically 110 ohms. The primary transformer windings are connected in
series. The transformer's secondary windings are connected in parallel
and connect directly to the XLR output pins.
So my real question is, I don't know how to calculate
the transformer impedance in this case ?
if we have 15.000 Ohm like the G7, how many ohms we can obtain ?
what are the consequence to the output gain ?
thanks
Visibly the Blue Bottle have a design
very close to the G7 :
" The Bottle vacuum tube amplifier consists
of a classic common cathode circuit using a current
source for the plate load "
"The amplified signal is taken from the plate and
fet through a high-quality Hovland polypropylene
capacitor bypassed by a smaller value polystyrene capacitor"
Why they bypass the blocking cap ? in the Auricap
web site they really against the bypassing ?!
"The Bottle Microphone employs an EF86 pentode
vacuul tube connected in a triode mode. The third grid of
the EF86 is connected with a cathode and is grounded"
"The amplifier input is separated from the microphone capsule
with a capacitance consisting of two styroflex caps (one ten times
the value of the other) mounted on special Teflon Isolators"
what is the goal of the Teflon Isolators ?
"The BLUE hand-built Bottle microphone transformer is balanced
using a symmetrical two-bobbin design, with a transforming ratio
of 13:1. With this ratio, the microphone achieves a low output impedance
typically 110 ohms. The primary transformer windings are connected in
series. The transformer's secondary windings are connected in parallel
and connect directly to the XLR output pins.
So my real question is, I don't know how to calculate
the transformer impedance in this case ?
if we have 15.000 Ohm like the G7, how many ohms we can obtain ?
what are the consequence to the output gain ?
thanks