Weber Mywatt 200 Leistungstransformator unknown make and specification

jmUK1

New Member
Beiträge
2
Bassix
ß54
Hello, greetings from the UK, I'm new to the forum, which looks very interesting.
I need to replace the power transformer in my Weber Mywatt 200, which is shorted and red coated.
So far, I have not been able to determine the brand and specification of the power transformer. If anyone has experience with this amplifier and can help, that would be greatly appreciated.
 
Hi,

4x KT88


6x EL34

 
I guess @jmUK1 means the power transformer which is a toroidal transformer in the Weber200. I used to own one but sold it about 10 years ago. Unfortunately I don't know supplier and type ID either.
 
You can take the specs from any replacement transformer for the DR201 and either use that or check for a toroidal transformer with usable specs (maybe Max had used custom transformers - i don't know). AFAIK (from Max Weber) the transformer is a 300W type, which is actually a bit low for 200W output. So 350 or even 400 W with suitable outputs is better.

Important: the Mywatt has 670V on the secondary power rail of the KT88.

@cfortner: thanks fpr the hint with Jan Wüstens. I would have given it, too.
 
I would suggest AC these voltages

1x 190V 1,2A
1x 280V 1,2A
1x 6,3V 10A with center tap
1x 15V 3A
1x 50 V 0,2A

Depends to the Mywatt circuit, may be little different to the Hiwatt DR201.
 
Zuletzt bearbeitet:
That means a 800VA transformer 😳 , enough for a 400W amp!

190V and 280V 0,6A may fit better, 350-400VA.

And you have to look at the BIAS DC voltage before installing the KT88, may be it is too low or too high, because we don‘t know the Mywatt AC voltages exactly.
 
Many thanks to everyone who responded so quickly with their answers and suggestions, especially Cfortner and Beate. You now have important insights that there doesn't seem to be a Weber website/contact!
This was a painful episode as the mains/power transformer damaged all four KT88s when it failed. I myself don't have the skills to work on this amp, and it's with a general amp technician who has no experience with the Mywatt. However, it seems that a solution will be easier than I first thought.
I will definitely do some research with Askjanfirst.com and tubetown.net.

Cheers
 
Mywatts are nearly exact clones of the corresponding Hiwatt amps with two differences:

-separate BIAS-regulation
-DC heater for the preamp valves

I recommend a more powerful torioid transformer 500-600VA, not very more expensive and not very more volume and weight.

What are the dimensions of the cracked tranny (in cm, diameter and height)? Perhaps a photo?
 

Beliebte Themen



Zurück
Oben Unten