300B DIY Tube Amp: ISO-Tango Output Transformer Upgrade!

Published at : 23 Dec 2025

In this video I am replacing the 5K 25W Edcor output transformers with some 3.5K 30W ISO Tango units (FC-30-3.5S II). I also explain what was causing the intermittent short circuit issue I ran into with this amp after changing the iron, which was baffling!

Below is a link to the USA distributor for these AMAZING transformers!!
http://tubesusa.com/ISO-main.html

You can contact George using for more information:
http://tubesusa.com/custserv.html

Please mention Skunkie sent you!

You can send me links and messaged at:
https://www.skunkiedesigns.com/contact

You can direct email me at stephe-at-skunkiedesigns.com

Here is my Patreon, as well as the donation page at my site, if you feel so inclined to help fund some of the future projects for the channel!
https://www.patreon.com/user?u=87080658
https://www.skunkiedesigns.com/donate

Here is where you can buy T-shirts and other Merch with my fun logo.
https://skunkie-designs.myspreadshop.com/all