two transformers into one

[DF96]

0-9 - 0-9 -CT- 0-9 - 0-9

If you can connect two 9V secondaries then you can connect four 9V secondaries, in exactly the same way.

[DUG]

Is this what you are trying to do?

With two diode bridges the phase relationship of the transformer secondaries does not matter.

When using a single diode bridge the phase is important.
Note the phase dots on the secondaries.

This is what (I think) DF96 was mentioning in post #2.

Sometimes a picture is worth a dozen posts.

[DF96]

Yes, either way will work but the OP was specifically asking about a CT (as he may be constrained by an existing PSU circuit).

[DUG]

I must have missed the CT reference.

I also have to correct the single bridge circuit to show the phase of the primary of each transformer. (more dot, etc.)

(my bad)

[AndrewT]

Originally Posted by MarianB

It is as simple as connecting the 2 transformers in series, theyr windings are not part of the same magnetic core so there is no special way to connect them, there is no phase to worry about, just connect the in series and then check the voltage

This is dangerous.
DF has already corrected you.

If this is an indication of your level of competence, then stop posting mains advice until after you have learned to speak sense !!!!! and safely !!!!!!

[AndrewT]

All three pics of Dug's posts 12 & 14 are correct. BUT NOTE the Phasing dots. These can be wrongly coded on a transformer. Don't accept the code as bible, test properly !!!!!!
You can safely adopt any of those schematics that suit your following circuit.

DF mentioned a bulb limiter.

I wish I had thought of that title before I repeatedly called it up as "mains bulb tester" (or bulb tester).
Build one of these. Threads all over the Forum on build and use details.

It will save many transformers and projects and even fuses from total destruction.

[PreSapian]

thank you gents. and doug, the picture indeed snapped my comprehension imto focus. the trafos are conmected like pic1 and making my amp sing beautifully at the moment

[nigelwright7557]

Put the two separate transformers on ebay and buy a single transformer.
This will be neater and take up less space.