----- Original Message -----
From: "Garey Barrell" <[email protected]>
To: "drakelist" <[email protected]>
Sent: Friday, April 01, 2011 7:13 AM
Subject: Re: [Drakelist] My R-4B audio?
Lee -
I rarely turn mine above 11 o'clock. What speaker are you
using?? The amplifier is designed for a 4 ohm speaker. An
8 ohm speaker (MUCH more common these days) will reduce
the overall output.
Try bridging C176. A high ESR (dried out) cap here will
reduce the gain of the stage considerably. Also verify
approximately 4.5 VDC on the Cathode (Pin 1) of V7.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
I don't agree with this. The level produced by a
speaker has more to do with its design, size of magnet, etc,
than its nominal impedance. I have both 4 and 8 ohm speakers
here, the loudest is an 8 ohm speaker probably for a
Hammarlund receiver. I have a couple of 4 ohm speakers which
are not so loud on the R4 or on a Collins R-388 which also
has a nominal 4 ohm ouput. Curiously enough Collins speakers
are 8 ohms. With the Hammarlund speaker the volume control
is around 10 or 11 O'clock, for some other speakers it must
be around 2 O'clock. If yours needs to be higher it may
indicate either a bad speaker or some audio problem. I would
also check with known good headphones.
--
Richard Knoppow
Los Angeles
WB6KBL
[email protected]
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