Hi Tim,

WARNING!
Please do NOT power up the amplifier again until this has been checked and corrected!

Something about your wiring doesnt look right to me, and Im concerned that it could cause serious damage.

First of all, Im not familiar with the transformers wire color coding or the kit itself.

From the pictures I assume the amplifier uses an EZ81 rectifier tube. However, the filament connections appear to use two different wire colors, which doesnt make sense to me.

Since there is only one PINK wire, I strongly suspect that it is actually the high voltage secondary center tap, rather than a filament connection.

1.) Check the Transformer Secondary Windings
With the amplifier completely disconnected from the mains and all capacitors safely discharged, use an ohmmeter to measure:

- PINK to PURPLE
- PINK to GREY

One of these combinations should read open circuit (infinite resistance).
The other might show something around 20 - 50 ohms, possibly more.

Based on these readings, we should be able to identify which wires belong to which winding.

My suspicion is that:
- The open circuit pair: Likely the 6.3 V filament winding for the EZ81 (pins 4 and 5).
- The pair showing resistance to PINK: Likely the high voltage secondary winding, with PINK being its center tap.

If confirmed against the transformers specifications, the PINK center tap would connect to ground through the designated fuse, while the two outer high voltage wires would connect to the EZ81 anodes.

Please keep in mind: If the wiring is indeed incorrect, the EZ81 filament or even the power transformer may already have been damaged.

2. Check Primary-to-Secondary Isolation

Once the winding identification is sorted out, theres another important check:
Measure the resistance between every secondary wire and every primary wire - these are a lot of readings.

All these combinations MUST read open circuit (infinite resistance).
If you measure any continuity, something is seriously wrong, and the transformer must not be connected to mains power - period!!
Note that an ohmmeter check alone does not prove that the insulation is safe.

3. Transformer Identification

Could you please tell me the manufacturer and part number of the power transformer?
If theres a datasheet or wiring diagram available for download, Id be happy to take a look.

Until we can positively identify all the windings and verify the wiring, please do not power up the amplifier again!

Please note: Im not taking any responsibility for the above!

Best regards, 

Geronimo

Thanks again.These are the two photo's of the power-section wiring.

Nicht die Schnellantwort verwenden, sondern über den grünen Button "Antworten" den Editor aufrufen. Dort können dann Bilder angehängt werden.

Grüße, Dirk

Whatever I'm trying with the photo's, it's not working, sorry...

Hi, thanks a lot for your replies!

Enclosed some photos of my wiring. The white and orange cable are not connected, I heatshrinked them seperately first, then together. The black center tap goes to ground. I'll try to disconnect the heater wires this when I have time, and make some new measurements.

EDIT: Excuse me, somehow I'm not able to enclose some photo's that are 300kb per file... 

Versuche gerade mal überall rumzuklicken, dabei fällt auf, dass ich keine Berechtigungen habe andere Benutzerprofile aufzurufen.

Ein Fehler ist aufgetreten!
Du hast nicht die Berechtigung, auf diesen Bereich zuzugreifen


Eigentlich müssten jetzt alle Berechtigungen zum Ändern von eMail, Signatur, Bankverbindung etc. drin sein, sodass die Anpassungen gemacht werden können.
Ich schau mir jetzt noch die Möglichkeiten bezüglich Info per eMail an.

Grüß, Dirk

Jetzt hat's funktioniert, auch sieht die Profildetail Seite her anders aus.
Es hat mir auch mein altes Profilbild angezeigt (das ich im Original nicht mehr habe, die Katze lebt aber noch ) aber das konnte ich nicht aktivieren/einfügen. Deswegen nun neues Profilbild....

Gruß
blues

PS: Änderung der Email Adresse geht hingegen (noch) nicht?

The OT secondary is one continuous winding, so you must have continuity between all 4 wires.

Versuche es jetzt noch einmal. 
Die Einstellung sollte über das Menü mit deinem Benutzernamen erreichbar sein und dann das Untermenü "Profildetails". 
Zumindest funktioniert das bei meinem Testbenutzer so...

Grüße, Dirk