Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12, 2025) x

Thread Closed

PT-25 audio distortion
#18

Good morning fellas -

I performed an alignment by ear several times which did increase the volume and clarity but did not resolve the underlying distortion. Each component replaced has made an improvement but there's still an issue that I haven't isolated. A couple of those resistors I replaced were past 20% out of tolerance and I was sure was the cause.

I worked from home yesterday but spent the day in the radio shop working on this and listening to AFRS Christmas broadcasts on my 66s. A great time but didn't get to the last two resistors. Kind of got side tracked a few times. One is a 4.7meg but my tester does not measure above 2M. Been thinking of getting myself a new Fluke.

I don't have a permanent magnet speaker to use as a test.
Could the volume pot be the cause, and if so, how to test?

I'm also not entirely sure the speaker isn't the cause.

Regards,
Paul


Messages In This Thread
PT-25 audio distortion - by WyTex - 12-19-2017, 12:45 PM
RE: PT-25 audio distortion - by morzh - 12-19-2017, 02:29 PM
RE: PT-25 audio distortion - by David - 12-19-2017, 04:08 PM
RE: PT-25 audio distortion - by WyTex - 12-19-2017, 04:09 PM
RE: PT-25 audio distortion - by Phlogiston - 12-19-2017, 04:37 PM
RE: PT-25 audio distortion - by morzh - 12-19-2017, 11:02 PM
RE: PT-25 audio distortion - by WyTex - 12-20-2017, 10:06 AM
RE: PT-25 audio distortion - by Steve Davis - 12-20-2017, 11:34 AM
RE: PT-25 audio distortion - by Phlogiston - 12-20-2017, 11:52 AM
RE: PT-25 audio distortion - by klondike98 - 12-20-2017, 12:01 PM
RE: PT-25 audio distortion - by Phlogiston - 12-20-2017, 03:28 PM
RE: PT-25 audio distortion - by klondike98 - 12-20-2017, 05:45 PM
RE: PT-25 audio distortion - by WyTex - 12-20-2017, 06:16 PM
RE: PT-25 audio distortion - by morzh - 12-20-2017, 06:46 PM
RE: PT-25 audio distortion - by klondike98 - 12-20-2017, 06:48 PM
RE: PT-25 audio distortion - by Arran - 12-21-2017, 01:52 AM
RE: PT-25 audio distortion - by morzh - 12-21-2017, 10:32 AM
RE: PT-25 audio distortion - by WyTex - 12-21-2017, 10:58 AM
RE: PT-25 audio distortion - by Phlogiston - 12-21-2017, 12:05 PM
RE: PT-25 audio distortion - by Radioroslyn - 12-21-2017, 12:33 PM
RE: PT-25 audio distortion - by morzh - 12-21-2017, 01:14 PM
RE: PT-25 audio distortion - by WyTex - 01-05-2018, 02:26 PM
RE: PT-25 audio distortion - by morzh - 01-05-2018, 06:09 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
54C Complete Teardown/Rebuild
Hello Roy, here is this one sincerely Richardradiorich — 12:45 AM
54C Complete Teardown/Rebuild
Richard, Had grabbed it already but thank you just the same.  I find myself wanting to find some way to block out the...glyphmon — 12:03 AM
54C Complete Teardown/Rebuild
Hello roy, here is a link to the schematic . Sincerely Richardradiorich — 11:54 PM
54C Complete Teardown/Rebuild
Richard, The Silvertone 2014 also is a transformerless set, so I am incorporating a 1:1 600 ohm audio isolation transfo...glyphmon — 11:37 PM
Preliminary work on wife's Silvertone 2014
Did an alignment today which was interesting.  IF alignment went great, almost all was already spot-on.  Adjusting on th...glyphmon — 11:35 PM
54C Complete Teardown/Rebuild
The main problem with adding a Bluetooth input is that this set lacks a traditional power transformer to isolate it from...radiorich — 11:19 PM
54C Cabinet Refinish
I started stripping this cabinet before it got super chilly out because I knew I wasn't going to be able to work on ...glyphmon — 11:18 PM
54C Complete Teardown/Rebuild
While I'm waiting to wrap up the final steps on my wife's Silvertone 2014, I started disassembly on the next project.  O...glyphmon — 11:07 PM
Preliminary work on wife's Silvertone 2014
Hello roy, that great news glad it worked out for you !! Sincerely Richardradiorich — 10:50 PM
Preliminary work on wife's Silvertone 2014
Safety caps arrived today.  Soldered one in and had a successful first power-up.  No magic smoke escaped and it tunes in...glyphmon — 09:53 PM

[-]
Who's Online
There are currently 1738 online users. [Complete List]
» 1 Member(s) | 1737 Guest(s)
Avatar

>