Carslbro 50 TOP

I got this Carslbro 50 TOP to fix (burnt OT).

Carlsbro-50TOP

OT : Drake 784-213 (4.4k Zaa)

Carlsbro-50TOP-PT-Drake

Schematic (thanks Chambonino !)

 50-top-Schematic

The point is : on « my » 50 Top, power supply is quite different : PT has a central tap and no bias tap.

50-top2

On this 50 Top, power supply conforms to the schematic

Carslbro50TOP-CT

The 50 Top I have to fix …

50TOP-PCB

So, I retraced its schematic :

50TOP-PSU

I replaced electrolytic capacitors, OT (Hammond 1750N, 3.2k Zaa for JMP50) and 47k bias replaced by a 100k variable resistor

Carlsbro-50TOP-Bias

It plays loud with great crunch. Nice vintage amp !

Website Pin Facebook Twitter Myspace Friendfeed Technorati del.icio.us Digg Google StumbleUpon Premium Responsive

This entry was posted in Amps. Bookmark the permalink.

Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>