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Tube pinout question
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El Duderino



Joined: 23 Jan 2011
Posts: 4142
Location: Portland, OR


PostLink    Posted: Sat Jan 05, 2019 1:36 am    Post subject: Reply with quote


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km987654 wrote:
No I have not but I suspect the full brightness is caused by NO G1.

Here are two neck cards of two 9" Sony tubes. If you look very closely at the SD146a neck card you can see it is labeled and has pin 9 connected to g1 (pin 4 is lower right and pin 5 is labeled g2). If you look at BG808s neck card you can see pin 9 is not connected. Sorry I cannot put label on picture at the moment.


Perhaps it's just camera / lighting artifacts, but several of the solder fillets on the SD146 image appear to be cold/cracked and worthy of a reflow to me. Laughing
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km987654



Joined: 25 Jul 2007
Posts: 2760
Location: Australia

TV/Projector: Barco BG809s


PostLink    Posted: Sat Jan 05, 2019 3:35 am    Post subject: Reply with quote

El Duderino wrote:
km987654 wrote:
No I have not but I suspect the full brightness is caused by NO G1.

Here are two neck cards of two 9" Sony tubes. If you look very closely at the SD146a neck card you can see it is labeled and has pin 9 connected to g1 (pin 4 is lower right and pin 5 is labeled g2). If you look at BG808s neck card you can see pin 9 is not connected. Sorry I cannot put label on picture at the moment.


Perhaps it's just camera / lighting artifacts, but several of the solder fillets on the SD146 image appear to be cold/cracked and worthy of a reflow to me. Laughing


Probably right. Those have not been used for years.
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