Build Basics FAQ : #2. POWER TRANSFORMERS!!

Second in a series of FAQ build basics. Here I discuss and outline how to go about choosing a power transformer for your build.

0:00 Intro
3:19 Two phase rectification
4:48 Full bridge rectification
6:50 Marshall schematic examples
10:04 Reading PT spec sheets
13:31 Configuring your Headfirst PCB rectification section
17:24 Setting up your DC relay and/or heater supply
21:35 A word on chokes
22:45 Hunting for Power Transformers

[docdeens]

Man, I've learned so much from your channel, I feel like you should be charging. If only you weren't halfway across the world, you would be getting a lot of free beer in trade for answering my stupid questions

[soapboxearth]

These videos are just amazing, Jason. Thanks for taking the time.

[russiangoose]

I'm loving this build basics series, please keep them coming! I'm eager to get building but I have a lot more I need to learn first before doing a scratch build

[fabronaut]

thank you for sharing this knowledge! I've only had older modelers / solid state amps, but have always been curious about tube amps. took me awhile to realize that many of my favourite crunch / distortion tones were associated with JCM 800 hot rodded Plexi style circuits, many of which probably had further modifications under the hood.

I used to think I couldn't get anywhere near that "sound in my head" without spending way more than I can justify as a tinkerer and rusty bedroom player. being able to do a DIY scratch build or modify a used example as you've demonstrated will likely go a long way to getting there! even if I don't go that route any time soon, it's cool and I'm learning interesting things along the way. cheers from Canada!

[clintn]

You should do a video series on a build from start to finish and sell it. Most youtube channels have vids on stuff like mixing, songwriting, programming drums etc. Having one on building would sell IMHO.

[dr.danamplifiers]

Another great video. Excellent pertinent points ✌🏼

[prook]

Thanks for this Jason just what I was looking for.

[matthewf]

I miss the hell out of Classictone too. I buy Mercury iron now. They’re the only other company I trust with stated specs. Hammond and Heyboer are all over the place on 120v primaries.

[buzzedalldrink]

I read Hammond makes direct replacement transformers, their 290 series, for guitar amps
that were reverse engineered from classic tones

[terribleligadelmal]

so... the 50w example works for the relays or not? i didnt get that part...

[Frankentoane]

I can still use a pt rated for 100w for a 50w mc2 build right? Granted i wire it in full bridge rectifier with the ct connected in between the first series filter caps, as mentioned here?

[johnmiller]

lots of inexpensive options for Fender PT replacements. Can these be used? Many of them are for 2 or 4 6L6

[natehaiden]

I'm actually just trying to search for information on how power transformers change the feel of using your tube amp. Perhaps you're a good resource.