Philco
RCA
80 in Colin 5687 by Stein June 2007
@ power supply 112 VAC with TungSol 5687
B+1 to output transformer/ B+2 to 5687 plate = 270/128 V
Working Eb for 5687 power stage/driver stage= 204/52 V
Ek/Ik @ 3k cathode resistor= 62 V/20.5 mA
Eg for driver = -2 V
B+1 data for various 80 as
| No, | make | NOS B+ V | Used B+ V | |||
| 1 | Crosley Ken Rad | 245 |
|
|
|
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| 2 | CBS Hytron |
|
| 267 |
|
|
| 3 | GE | 273 |
| 269 |
|
|
| 4 | Marconi-RCA | 271 |
|
|
|
|
| 5 | Marconi-Cunningham |
|
| 272 |
|
|
| 6 | National Union | 272 |
| 271 | 272 |
|
| 7 | Philco | 273 | 277 | 273 |
|
|
| 8 | Raytheon JAN | 275 |
|
|
|
|
| 9 | RCA | 262 | 270 | 270 | 270 | 266 |
| 10 | Silvertone | 275 |
| 274 |
|
|
| 11 | Syvania |
|
| 278 | 274 |
|
| 12 | Ward |
|
| 257 |
|
|
| 13 | Wizard |
|
| 264 |
|
|
No. 1 Crosley K-R電木座有點裂痕，但性能正常
平均整出B+ 270V 比5U4 B+=285V低約15V
Colin 5687-5687-80 套件裝機記錄 by Stein June 2007
June 2007代工David完成Colin 80整流管-5687-5687-直交amp.
因80管Colin缺貨，我另向美國下訂24支，不要的讓給Colin.
80管暫時拿5R4W 冰淇淋管or 5U4代用。B+較原來80設計高出25V.
試過上圖的5687，果然名不虛傳，好聲。
暫用7119耐熱高1成。
5687配線
應David希望，加裝LED指示燈。
插上電源，亮綠燈待機。
把指撥開關自下向上扳到中央時，送上5687的燈絲加熱，要在等10秒鐘以上，再撥到頂，送上B電燈絲加熱。3秒鐘後自然會亮紅燈，開始唱。
