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Old 7th May 2011, 08:15 PM   #1
tryonziess is offline tryonziess  United States
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I am winding a pair of output transformers for my gu50 amp and was wondering if using a solid state amp, like my Leach, for the bass extension to 250 hz and below would help to make the tube amp transformer smaller. I have chosen a core which should be suitable for all of the music frequency, however if I limit it to 250 hz and above the overall load should be dramatically reduced. I have read somewhere that tube output transformers operating in the 80 hz and below range need to be quite robust. Something like twice the power output for each halving of frequency.
The math for this project has gotten to a point where it is no longer FUN.
I like to build things that others with more patients have already worked the bugs out of. I believe I have a very sound layout from Christl Ludwig in Germany I just do not want to screw this design up. Most of the discrete elements have been sourced and purchased including the transformer cores, tubes, sockets and misc. resistors and caps.
Being my first, EVER, tube project I am quite reluctant to just jump in.
Mistakes are much more expensive in tubes than solid state. Along with the relatively limited supply of materials. Solid state components are available everywhere and at surplus prices. Not so tubes. Especially the iron.

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Old 7th May 2011, 09:39 PM   #2
Globulator is offline Globulator  United Kingdom
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Congrats - like to see the schematic, I'm a GU50 fan too!

Personally I find tubes cheaper with mistakes because they tend to withstand being connected up wrongly or being overloaded - silicon tends to just die
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Old 7th May 2011, 09:49 PM   #3
pieter t is offline pieter t  Netherlands
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Join Date: Apr 2009
Hi Tad,

As you have the stuff already my advice is to build the amplifier as you planned in stead of tweaking around with the opt.
When there is some capacitor coupling from driver stage to output stage (or from input to driver stage) it is simple to calculate capacitor values to cut LF when you want to give that a try.
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