Sommerkamp FRdx500
Infos
- Photos : https://imgur.com/a/KZQUK
- Manuel : PDF
- Schematic : PDF
État
- Fonctionnement global très bon
- Tous les contacts sont passés au nettoyant contact
- 160m : muet
- 80, 40, 20, 15 : ok
- 10 A, B, C, D : semble ok
- WWV : une résistance a fait pouf, remplacée.
- CB : Pas testé cf. WWV
- Topic sur la restauration: http://antiqueradios.com/forums/viewtopic.php?f=5&t=324225
Décalages / Offsets
- F. finale = F. lue + l'offset
- 3970KHz lu, bande des 80m, ajouter 5KHz, donne 3975KHz
| Bande | Offset | Note |
|---|---|---|
| 40m | -5KHz | Validé avec deux stations fortes |
| 80m | -5KHz | Validé avec deux stations fortes |
Tubes
References
| Tube | Qty | Bought | From | Notes |
|---|---|---|---|---|
| 6 BZ6 | 2 | 6BZ6/6JH6 - Pentode, Semi-Remote Cut-Off | Antic Electronic Supplies | |
| 6 U8 | 2 | 6KD8/6U8A - Triode - Pentode | Antic Electronic Supplies | |
| 6 BE6 | 1 | 5750/6BE6W - Heptode | Antic Electronic Supplies | |
| 6 BA6 | 2 | 5749/6BA6W - Pentode, Remote Cut-Off | Antic Electronic Supplies | |
| 12 AT7 | 2 | 12AT7 China | Antic Electronic Supplies | |
| 6 BM8 | 1 | “Hi-Fi” |
To buy : 1x 12AT7, 1x 6BM8 (V106 & V108)
Sockets
| Socket | Qty |
|---|---|
| 7P | 5 |
| 9P | 3 |
Modifications à faire
Quartz pour Fix Oscillator
- 4, inconnus
Filters
- MF455-03AZ (600cps)
- MF455AO50F (5 kc)
- MF455A240F (24kc)
- Trouver les var-cap associés (G27, P278)
Mods & Options
100Kc / 25Kc Marker
- Used this build with a 12.8MHz xtal
- Wiring in the FRDX
- White wire : +13V (to check) DC, power
- Green wire : 25Kc output from marker
- Yellow wire : 100Kc output from marker
Troubleshoot
01/04/2020
Did some measurements, tube V106 pins are off:
- 1, expected 80, got 102
- 6, expected 200, got 227
- 7, 210, 239
- 8, 105, 123
- 9, 175, 234
Ordered replacement caps for C179 and the two 0.01uF on the transformer.
Replaced C187, 1uF measured 1785nF on the cheap tester.