Later TR7¡¯s did not suffer this problem. It seems the pot was changed to one which got to zero ohms before the click.?
Gary
W0DVN
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On Jan 2, 2025, at 3:44?PM, Rob Sherwood via groups.io <rob@...> wrote:
The R-4C has the same problem. It may go clear back to my original R-4. ?Rob, NC0B-----Original Message-----From:?[email protected]?[mailto:[email protected]] On Behalf Of jerry-KF6VBSent: Thursday, January 02, 2025 11:15 AMTo:?[email protected]Cc: Jim Shorney via?Subject: [DRAKE-RADIO] TR7 AudioOne minor audio annoyance with the TR7 - the volume control doesn't go?all the way to zero.Instead of a tradition voltage divider pot, they do something with the?AGC. ?So to getthe thing to quiet down, I also turn down the RF gain.?????????????????- Jerry, KF6VBOn 2025-01-01 08:06, Jim Shorney via groups.io wrote:FWIW the TR7 uses an LM380. It works pretty well.
On Wed, 1 Jan 2025 10:45:24 -0500
"Mike Bryce via groups.io" <prosolar@...> wrote:
FYI¡ I designed an audio amp board for the R4C that used a LM380.?
Worked great and had plenty of humph to drive the MS4 speaker to room?
filling volume
--
73
-Jim
NU0C
