Re: Why don't guitar amps use Toroidal Transformers

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4/28/2003 5:08 PM
Andy	Re: Why don't guitar amps use Toroidal Transformers If you go to http://www.londonpower.com they offer a series of books called "the ultimate tone" TUT for short. I don't personally own these books, but they come highly recommended by everone on this board who owns them. these books should tell you more than you'll ever need to know about designing a tube guitar amp.

 

4/28/2003 9:44 PM
Chris ( CMW amps )	I did use PT-donuts and they're great . Slightly smaller then regular ones and less hum .   Did hear a couple of GUITAR amps with donut OTs and I really didn't like their sound .     Some cool info about starting to build a 1st tube-amp can be found on the AX84 forum .     Have fun building and be carefull with the high voltages !     Chris   Driebergen , The Netherlands

 

4/29/2003 11:45 AM
pef	I've play with a 2x100 watts power amp with toroidal OT/PT and it sound awasome to me !   (I drive this amp with a Rocktron Pirhana.)   I think the best way is trying... Amplimo make good toroidal transformers (ot/pt) and the price is correct.

 

4/29/2003 1:02 PM
KB	My SLO has a Plitron 654708 PS sitting on the top and it absolutely smokes and is quiet to boot.,     KB

 

4/29/2003 9:16 PM

O'Connor

I use toroids for power in my London Power amps of 50W and up, and also in the pro gear (tube DIs, mic splitter/pres, etc.). Output transformers are EI for tone and freedom from DC current imbalance concerns.     Toroidal output transformers tend to be expensive as they are priced for a "what the market can bear". PTs tend to be competitive but still more expensive than an EI of the same ratings. Stray magnetic hum is much reduced in the toroid, and is practically eliminated with the core band all of ours are spec'd with.     Part of the "classic" tones everyone likes and to some extent expects, comes from the imperfections of EI OTs. You will lose this aspect of the sound going to a toroidal output but you can make some other circuit accommodations to get where you want to be. Aguilar uses toroidal OTs to save space. He doesn't have to worry about how they sound in the mids and highs - where all transformers can really shine - because he is building bass amps. Guitar amps built with toroidal OTs don't tend to sound right becuase the designer neglects to compensate for what is expected.     TUT3 covers some of this discussion and is a guide to proper amp construction and grounding. It demonstrates through the projects of iconic amps - amps everyone knows - how to do things correctly. You will end up with a "Bassman" or "Plexi" that is much quieter than a factory unit, and that is safe to bias and can use any tube type.     The TUT-series covers all aspects of guitar/bass amp design and construction.     Have fun   Kevin O'Connor

 

5/1/2003 7:11 PM
MBSetzer	i built a toroid-based power supply for some solid-state experiments.     It does seem to have less hum, and in other areas of the circuit I have gotten some really low-noise performance.     One of the only advantages I see for solid-state amps is the potential for lower background noise, so it seemed like a good idea for that purpose.     Mike

 

5/2/2003 12:24 AM
Trace - Voodoo Amps	The newer Laney amps do use those (the GH100L I think? Don't quote me on the exact model--ha, ha) The use them for the PT and they sound great. Very quite and no added hum from the PT.     For what it's worth   Trace

 

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