Build Basics FAQ #3 : OUTPUT TRANSFORMERS!! ...and primary impedance

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Third in a series of FAQ build basics. Here I discuss and outline how to go about choosing an output transformer for your build, and also go on to discuss the fundamentals of an OT's primary impedance.
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0:00 Intro
1:30 Cheat sheet table
3:30 Primary impedance Rule of thumb
7:33 Primary impedance basic theory
13:33 Outro

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7 июл 2024

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Комментарии : 35

@komorowski381 Месяц назад

Finally a video that made it understandable for me .Many thanks 🙏🏼

@PhuketMyMac Месяц назад

Thank you again Jason! So much to learn and you’re really helping. I might have said that already but you’re the Louis Rossmann of guitar tube amps!

@russiangoose7053 Год назад

Please continue the build basics series! These videos are the most helpful ones I've seen!

@HeadfirstAmps Год назад

Glad you like them! What else would you like me to cover?

@russiangoose7053 Год назад

@@HeadfirstAmps now that I look through your videos you've done most of what I could think of off the top of my head. Maybe you could cover lead dress and ground schemes? Or perhaps biasing in practice? Whatever you cover I just appreciate the knowledge you share!

@PhuketMyMac Месяц назад

@@russiangoose7053ground schemes would be a great one!

@felinekaiju4517 Год назад

found useful?. I learnt something alright!. I'm glad that at 40 I'm understandinig concepts that would have fried my brain. I consider this Output tranformers for dummies!!. love it!.

@wakjob961 2 года назад

I was just like you about ten years ago. Totally obsessed with this stuff. Morning noon & night it was all I thought about....modding, experimenting, theorizing, studying caps and resistors ect... I just watched my playing skills take a huge nosedive as my soldering skills went through the roof !!!

@HeadfirstAmps 2 года назад

Find time for both!

@marvelharris9540 2 года назад

Fantastic job Jason!

@lechstryzewski9350 2 года назад

Yet another fantastic video Jason!! - The way you deliver the information makes it very easy to understand. Thanks man !!!

@HeadfirstAmps 2 года назад

Thanks Lech, that’s the goal for sure. Make it easy!

@andrewwilliams5042 2 года назад

Great information / explanations, amp audio, production. Working my way back through the older videos.

@BCEpedals 8 месяцев назад

This was so helpful!

@NewReligion1954 2 года назад

This was explained very well. Great video Jason. Thank you for all of the great support in our community. David Hopkins.

@HeadfirstAmps 2 года назад

Tnx David.

@cheyneluke9330 2 года назад

Fantastic thanks Jason!

@TheFrozenDesert 2 года назад

I am so glad I heard you on Tone Talk. Brilliant.

@HeadfirstAmps 2 года назад

Thanks!

@danielsaturnino5715 2 года назад

Thanks for sharing your knowledge :)

@LucasMastropasqua 4 дня назад

I still love revisiting your videos all the time, especially great as reference when I am working on something and need to refresh my memory. I was wondering, with a speaker load attached is there any way to measure the primary impedance, if for example you have an OT in an amp but don't know what specs are? The other question is if measuring the resistance of the primary should the resistance be equal on either side of the center tap?

@shredding51 10 месяцев назад

Great video! Think i have a OT going out on my jcm 800 2204

@cobar5342 Месяц назад

Great video. I find this subject very difficult to grasp

@schmolly75 2 года назад

Marshall 100w uses four tubes and needs 1.700 ohms at primary. If your remove two tubes to get only 50W, the two tubes need 3.800 ohms at the primary. So if the 100w have a 16 ohms cab connected to the 16 ohms terminal output, to get 3.800 ohms with two tubes you only need to move the jack of the cab from the 16 ohms terminal to the 8 ohms terminal.

@HeadfirstAmps 2 года назад

Correct! It’s a useful additional point this.

@HandWiredAmps 7 месяцев назад

The Origin 20 output transformer on my bench measures 5.4k Perhaps they decided to go with an impedance that's less efficient, as they only needed 20 watts, or, to fit better with the power scaling? Would have been a good question for Santiago's Q&A. Thanks for the video Jason!

@HeadfirstAmps 7 месяцев назад

Yeah, as you drop the b+ voltage you’d increase the primary to keep the operating point optimal.

@freaksarise Год назад

Hi Jason, when power scaling such as with the JCM 800 Studio Classic whereby the plate voltages are lowered to achieve the scaling, how does this affect the OT with respect to the equation (b+ voltage)2 / (plateDissipation X numOfTubes)? Thanks!

@HeadfirstAmps Год назад

It changes the performance for sure, they are so coldly biassed it's not an ideal operating point.

@ramilrodriguez8340 Год назад

Very nice. Do those formulas work with single ended amps?

@HeadfirstAmps Год назад

No, only push pull

@Phantasm70 8 месяцев назад

What's your preference for output tap Jason, the least or greatest resistance?

@HeadfirstAmps 8 месяцев назад

Makes no difference, as long as your negative feedback line is not connected to the speaker jack.

@jpb962 2 года назад

I know this is a tech video, and I thank you Jason for sharing your knowledge, I've learned a lot from your channel in the past year or so. But WTF JASON! I feel ripped off. I watched the whole video hoping that you would close it out with some a$$ kicking and face shredding on one of your amps!

@HeadfirstAmps 2 года назад

Hahaha, will keep this in mind!