> Personally, my voice is a little higher from center in pitch..and I'd
> prefer more lower than higher freq. response...which is generally
> a problem due to low freq. rolloff in the mike curves...
Steve, this makes me think that your best bet would be to close-talk a
unidirectional mike. A low-
Jim,
That is an interesting circuit with the plate grounded and
output taken from the screen grid as an anode. I don't quite see the
advantage other than fewer parts. The gain seems to be about 10 db less
if I read it right. Perhaps the screen to grid capacitance is much
lower than an e
[EMAIL PROTECTED] wrote:
I appreciate all your time and help, guys.
Excuse me for not mentioning the cathode resistor for bias.
From what little I have found...both the Collins 310A exciter and WRL Globe
King 275 use a 6SJ7 for mike input...in which case, a hi-Z dynamic should work.
So...b
Generally, precise impedance matching is only necessary where tuning
and loading are critical because of large power transfers, or where
absolute minimum noise is important such as weak signal work.
Crystal microphones are equivalent to a resistive source impedance
of a few K ohms in series with a
In a message dated 3/15/05 9:31:31 AM, [EMAIL PROTECTED] writes:
> Which means that my Electro-Voice 729 is a candidate which is already on my
> shelf...sparkling since I polished all that cast metal to high sheen.
>
>
Steve,
Your EV 729 should work fine. I would add a grid leak resistor,
Steve,
I'd put a 4.7Meg to 10Meg resistor from the 1st 6SJ7 grid to ground. A
crystal mike wants to work into a (high value) resistive load.
GL,
-Larry/NE1S
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of
[EMAIL PROTECTED]
Sent: Tuesday, March 15, 200
I appreciate all your time and help, guys.
Excuse me for not mentioning the cathode resistor for bias.
>From what little I have found...both the Collins 310A exciter and WRL Globe
>King 275 use a 6SJ7 for mike input...in which case, a hi-Z dynamic should work.
So...back to square #1 - what is "
Even with the 5100B released to replace the 5100, B&W still had to issue
a bunch of service bulletins for the B model.
Pete, wa2cwa
> > -- Original Message --
> > From: George KB2Z <[EMAIL PROTECTED]>
> > Reply-To: Discussion of AM Radio
> > Date: Mon, 14
Hi All,
Two years ago I bought a new PMC320 crystal element from Omnitronics for
19.99 + $7.00 S&H. This is the stock OEM mic element for a D-104. I just
called them today, and they now only replace the cartridge on your D104
head. They no longer just sell the cartridges.
If you
The 5100B was plug and play with the 51SB-B Sideband Generator. I had one
of each and the 6100 too! Best I remember that is the main difference. Mike
K4XM
>
> -- Original Message --
> From: George KB2Z <[EMAIL PROTECTED]>
> Reply-To: Discussion of AM Rad
Hi Steve,
What's the finals on that rig, 813's? I think I have a rig just like that
here.
Can you describe the rig? Is a schematic available?
TIA,
73,
Ed, VA3ES
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Behalf Of
> [EMAIL PROTECTED]
> Sent: Tuesday,
First of all there should never be an element of any tube that is
left open as far as DC is concerned, and typically, crystal microphones have
no measurable DC leakage so it is an open circuit to DC. If a Crystal
microphone is to be used on this circuit the tube would soon go to cut off
or
Steve,
I just was reading about this in my "Radiotron Designers Handbook"
where a simple preamp using a 6SJ7 was used with a crystal microphone. In
short you can use a higher grid resistance to change the frequency response
(more lows), but the text describes the limitations involving rever
George KB2Z wrote:
Thanks all, for the replies. I gained a lot of information from them.
Would any one know of a website, or other place, where information
specific to the 5100 / 5100B
could be found?
Again thanks, George kb2z
http://www.google.com/search?q=%22B%26W+5100%22&sourceid=mozil
Thanks all, for the replies. I gained a lot of information from them.
Would any one know of a website, or other place, where information specific
to the 5100 / 5100B
could be found?
Again thanks, George kb2z
At 09:30 AM 3/14/05 -0500, you wrote:
Morning all,
Could anyone on the list tell
Thanks Guys:
This mike is for a vintage 1948 AM rack rig homebrew by W2PLY who moved into
Senior Residence.
The speech amplifier/modulator schematic is right from August 1947 QST.
I got the rack and the 5 sections directly from the flat bed trailer at the
estate sale...and now just about finish
John Coleman wrote:
This is correct, and a lot of the "pre-amped" microphones or very
good and some or not. I used an old dynamic microphone case and pulled the
guts out of it. It had been in a flood. Then built a preamplifier and
condenser microphone on a small PC board and installed
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