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trinityamps.com • View topic - 30W Schematic & Layout

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 Post subject: 30W Schematic & Layout
PostPosted: Wed Mar 23, 2005 10:14 pm 
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Holy Ghost
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If you are interested in a layout for a 30W, I posted them:

Untested Layout at:
http://www.trinityamps.com/ForumGallery ... layout.gif

This is Ken Smith's prototype layout. I have emailed him to see if there is an update and will post any updates here as well.

Schematic at:
http://www.trinityamps.com/ForumGallery ... ematic.gif

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Last edited by coco on Sun Jun 15, 2008 9:57 am, edited 2 times in total.

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PostPosted: Wed Mar 23, 2005 11:09 pm 
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Ken replied to me. Looks like a project. Any takers? :idea:
+++++++++++++++++++++++++++++++++++++++++++
I quit working on that some time ago and decided to just go with the Lightning, built from your layouts, I might add. It works perfectly for me. Since I play mostly low gain, I decided to just build the 12AX7 channel and forgo the EF86, plus the 15 watt power section of the Lightning is MORE than enough noise for me! I need 30 watts like I need a hole in the head.

That layout has some significant errors in it, BTW. It might be a place to start, but it does need lots more work.

Thanks for asking, and I wish you well in your venture. I have seen your forum, and it is great.

Thanks,
KS

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I'm just sitting here thinking about it( the switch in power options) and I can;t see how the separate cathode resisters would actually fix the impedance mismatch?! Granted i don;t have the equipment to tell whether or not it does fix the impedance problem, but this topic is one that's really getting under my skin. Any takers?!


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PostPosted: Sat Nov 26, 2005 1:57 pm 
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There is only 1 effective cathode resistor for each configuration. 62 for Hi and 130 (68 + 62) for Lo.

When the 4 tubes are in parallel, the impedance is 4K, when only 2 (Lo power) the impedance is 8K. When they switch this to low power on the 30W OT, which is 4K, you get the "Lightning" output stage with the mismatch and 130 ohm cathode resistor. Back to Hi, you get matched impedances and 62 ohm cathode resitor.

Kind of like getting two amps in one. Matched & Unmatched.

All is Well!

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PostPosted: Sun Nov 27, 2005 7:03 pm 
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PostPosted: Mon Nov 28, 2005 2:13 pm 
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PostPosted: Tue Jul 27, 2010 5:52 pm 
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I'm bringing this post from way back, but couldn't you just use an OT with multiple taps to rematch the impedance by switching taps via the speaker impedance selector?

I have done this in a 5E3 based amp with an 8 ohm speaker. With a correctly specified PT and OT, I used a 5Y3 rectifier and 6v6 power tubes in the 4 ohm tap and both 5U4 and 5AR4 with EL34 and 6L6 tubes using the 8 ohm Tap. Voltages were correct, no excessive heat and great sound. OT primary was 4,000 ohms / 8 ohm tap and should double that in the 4 ohm tap, right?


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PostPosted: Tue Jul 27, 2010 7:53 pm 
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You are correct. You can mismatch the OT / speaker and thereby change the refelcted impedance the power tubes see. And it will work just fine.

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PostPosted: Fri Sep 27, 2019 7:11 am 
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This information was very useful for me thanks for sharing this information.


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