Seeburg MRA1-L6 AMP question
I just finished installing a replacement cap kit in the above-mentioned amp. It is being used in a M100C. Using a redhead cartridge (with good needles) I'm finding the output of the amp is poor. Even with the volume maxed the output is nominal. I tested the tubes and the 6V6 drivers only read in the 50 percent range. A couple were 51 -52 but still low. Do you think a fresh set of tubes will increase the output? Regards, Rick
Off hand I don't remember if that schematic shows signal voltages (inside circles). But if it does, you can check to see where the signal is low and go from there. You will need a square wave input signal. Tony On 9/24/2023 4:37 PM, Jukebox Repairman via Jukebox-list wrote:
I just finished installing a replacement cap kit in the above-mentioned amp. It is being used in a M100C. Using a redhead cartridge (with good needles) I'm finding the output of the amp is poor. Even with the volume maxed the output is nominal.
I tested the tubes and the 6V6 drivers only read in the 50 percent range. A couple were 51 -52 but still low.
Do you think a fresh set of tubes will increase the output?
Regards, Rick _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
What cartridge are you using? On Sun, Sep 24, 2023 at 6:24 PM Tony Miklos via Jukebox-list < jukebox-list@lists.netlojix.com> wrote:
Off hand I don't remember if that schematic shows signal voltages (inside circles). But if it does, you can check to see where the signal is low and go from there. You will need a square wave input signal.
Tony
On 9/24/2023 4:37 PM, Jukebox Repairman via Jukebox-list wrote:
I just finished installing a replacement cap kit in the above-mentioned amp. It is being used in a M100C. Using a redhead cartridge (with good needles) I'm finding the output of the amp is poor. Even with the volume maxed the output is nominal.
I tested the tubes and the 6V6 drivers only read in the 50 percent range. A couple were 51 -52 but still low.
Do you think a fresh set of tubes will increase the output?
Regards, Rick _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
Don, please read my entire post. I stated I’m using a redhead cart with good needles. This is not a cartridge issue. Regards Rick On Sun, Sep 24, 2023 at 8:48 PM Donald Whiting via Jukebox-list < jukebox-list@lists.netlojix.com> wrote:
What cartridge are you using?
On Sun, Sep 24, 2023 at 6:24 PM Tony Miklos via Jukebox-list < jukebox-list@lists.netlojix.com> wrote:
Off hand I don't remember if that schematic shows signal voltages (inside circles). But if it does, you can check to see where the signal is low and go from there. You will need a square wave input signal.
Tony
On 9/24/2023 4:37 PM, Jukebox Repairman via Jukebox-list wrote:
I just finished installing a replacement cap kit in the above-mentioned amp. It is being used in a M100C. Using a redhead cartridge (with good needles) I'm finding the output of the amp is poor. Even with the volume maxed the output is nominal.
I tested the tubes and the 6V6 drivers only read in the 50 percent range. A couple were 51 -52 but still low.
Do you think a fresh set of tubes will increase the output?
Regards, Rick _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
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Oh sorry didn’t see that… On Mon, Sep 25, 2023 at 1:55 PM Jukebox Repairman via Jukebox-list < jukebox-list@lists.netlojix.com> wrote:
Don, please read my entire post. I stated I’m using a redhead cart with good needles. This is not a cartridge issue.
Regards Rick
On Sun, Sep 24, 2023 at 8:48 PM Donald Whiting via Jukebox-list < jukebox-list@lists.netlojix.com> wrote:
What cartridge are you using?
On Sun, Sep 24, 2023 at 6:24 PM Tony Miklos via Jukebox-list < jukebox-list@lists.netlojix.com> wrote:
Off hand I don't remember if that schematic shows signal voltages (inside circles). But if it does, you can check to see where the signal is low and go from there. You will need a square wave input signal.
Tony
On 9/24/2023 4:37 PM, Jukebox Repairman via Jukebox-list wrote:
I just finished installing a replacement cap kit in the above-mentioned amp. It is being used in a M100C. Using a redhead cartridge (with good needles) I'm finding the output of the amp is poor. Even with the volume maxed the output is nominal.
I tested the tubes and the 6V6 drivers only read in the 50 percent range. A couple were 51 -52 but still low.
Do you think a fresh set of tubes will increase the output?
Regards, Rick _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
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_______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
I would check all your resistors particularly the ones over 100k or high wattage. Also plate voltage on the tubes. On Sun, Sep 24, 2023 at 4:38 PM Jukebox Repairman via Jukebox-list < jukebox-list@lists.netlojix.com> wrote:
I just finished installing a replacement cap kit in the above-mentioned amp. It is being used in a M100C. Using a redhead cartridge (with good needles) I'm finding the output of the amp is poor. Even with the volume maxed the output is nominal.
I tested the tubes and the 6V6 drivers only read in the 50 percent range. A couple were 51 -52 but still low.
Do you think a fresh set of tubes will increase the output?
Regards, Rick _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
-- Paul Howlett Pinball Paul's 703-361-0420
participants (4)
-
Donald Whiting -
Jukebox Repairman -
Paul Howlett -
Tony Miklos