| Author |
Message |
    
Audio_drive
New member
Username: Audio_drive
Post Number: 8
Registered: 1-2009
| | Posted on Sunday, February 12, 2012 - 8:17 pm: | 
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my 959 went from 7 watts dead key with great audio -to full power =( 30 watts) and NO audio..... side band works fine .
anyone know what blew inside ? |
Press_man
Intermediate Member
Username: Press_man
Post Number: 397
Registered: 5-2008
| | Posted on Tuesday, February 14, 2012 - 11:59 am: |
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Start with the alignment.
Check for a bridged solder joint.
Have you done mods around driver or final?
Check for bad zenor close to final.
Check bias voltage on final.
Is radio less than 2 yrs old? Send it in for repair.
73
Pressman/KC4ZWM
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Goat373
Intermediate Member
Username: Goat373
Post Number: 370
Registered: 3-2005
| | Posted on Wednesday, February 15, 2012 - 12:15 am: |
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More than likely is the mod amp. Part #b574. Can be replaced with the better #B817. Rear right of the radio, big three leg right by the power inputs.
Brian
CEF#0574
KI4LXH
HAM#163
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Press_man
Intermediate Member
Username: Press_man
Post Number: 398
Registered: 5-2008
| | Posted on Wednesday, February 15, 2012 - 7:35 am: |
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Goats probably right. I thought about it after posting and the am amp is out of circuit in SSB mode so SSB would work OK. I've seen a lot of postings around the web about these being weak in 949/959.
73
Pressman/KC4ZWM
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Dale
Senior Member
Username: Dale
Post Number: 1832
Registered: 12-2002
| | Posted on Wednesday, February 15, 2012 - 11:36 am: |
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I gotta 3900 that after tune up dk 3 and only swings to 6 watts
Its the original and has one 1969 final.could it. Be same thing
dale/a.k.a.hotrod
cef426
cvc#64
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Sonoma
Intermediate Member
Username: Sonoma
Post Number: 214
Registered: 11-2001
| | Posted on Wednesday, February 15, 2012 - 12:12 pm: |
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galaxy has gone to the 2sb827 on the new radios due to the trans going out. |
Audio_drive
New member
Username: Audio_drive
Post Number: 9
Registered: 1-2009
| | Posted on Wednesday, February 15, 2012 - 11:53 pm: |
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yes ! it was the B 817 - i put a new one in & works fine - i heard if you volt the final- jump tp 7 & 9 together and connect the middle pin 8 to the 12 volt supply the B 827 or what ever part you have in there doesen't get too hot --.anyone have any input on this? |
Goat373
Intermediate Member
Username: Goat373
Post Number: 372
Registered: 3-2005
| | Posted on Thursday, February 16, 2012 - 12:09 am: |
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@Dale. What was it doing before tune up?
Brian
CEF#0574
KI4LXH
HAM#163
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Press_man
Intermediate Member
Username: Press_man
Post Number: 400
Registered: 5-2008
| | Posted on Thursday, February 16, 2012 - 8:21 am: |
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Audio drive,
Thanks for posting your repair outcome ! Too often a thread is dropped because no one knows how the project went.
73
Pressman/KC4ZWM
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Dale
Senior Member
Username: Dale
Post Number: 1833
Registered: 12-2002
| | Posted on Thursday, February 16, 2012 - 12:58 pm: |
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@goat no forward swing at all.all dead key
5 watt dk no foward pep
radio is stock EXCEPT basic tune-up
dale/a.k.a.hotrod
cef426
cvc#64
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