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As you all know, I build small practice amps. Over the years I have developed a line of easy to build circuit board amp kits. Transformers always come up as the question. Where do I get them. Why are they so expensive. Well, here is a solution that you may like. Triad offers a isolation transformer model N-68X. This transformer can be used for your high voltage source and delivers high current. The only problem is, it does not have the 6.3vac winding for your tube filaments, so you have to run an additional transformer. Lucky, those hobbyist trannys are fairly inexpensive. I find them often on ebay. Plus Jameco electronics carries one that will work for approx $10.95, Part #102163. I have built quite a few amp using this combo with great success. If you want one of my custom boards, see d-labelectonics.com. Complete build details for the amp shown in this video are on my Patreon acct. See: / dlab_electronics