nordmende: 1/616; Caruso-Stereo

ID: 35170
nordmende: 1/616; Caruso-Stereo 
17.Oct.04 04:07
0

Robert Sarbell † 22.3.22 (USA)
Articles: 363
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Robert Sarbell † 22.3.22

For what main reason is the 0,2 Cu Heiz-sicher placed at this point on the filament heizung portion of Netztrafo - as depicted on schematic?? Is fuse placed between pins 4 or 5 of EL84 and ECC85??
mfg,
Robert Sarbell

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 2
Cu -Wire in Filament -Cicuit off Tubes 
17.Oct.04 12:31

Hans M. Knoll (D)
Editor
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Hans M. Knoll

Hello Robert,

nice to meet you.

Here my answer:

This 0,2 mm Cu wire, is the "Fuse"  to protect the  Cu-connections " Leiterbahn" on the Printed Board. The Power Transformer is able to deliver more then 20 Amps in this case: a Tube makes an Shorting inside of the Bulb, or the Condensor C 136 on the  EABC80 have a shorting.

The high current from Transformer destroys the only 35 um Cu -Foils on the PC-Board. 
The 0.2 mm Cu Wire in the Set, prepare a <designed disconnection>  (in german = Sollbruchstelle)  to prevent this Trouble. 

I hope you understand.  In Grundig Sets you can find this Versions off Fuses

Greadings from Frankonia, Hans M. Knoll

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 3
Fused protection of Printed Circuit board 
17.Oct.04 16:17

Robert Sarbell † 22.3.22 (USA)
Articles: 363
Count of Thanks: 6
Robert Sarbell † 22.3.22

Guten Tag Hans,
Thank you so much, I fully understand the rationale. I have not worked with many tube radios that use the printed circuit boards. Most always the point-to-point wiring connections of the older receivers.
Robert

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