Mods on leak stereo 20 - Page 3

EC8010 · 25th April 2004, 04:14 PM

The decision about whether to use feedback, or not, can be made after the event. The important choice is the output transformer. Valve amplifiers stand or fall by their output transformer. Shipping iron from the UK to Argentina is probably not economic (so how come we buy your corned beef?). I imagine something from the Hammond range ought to be suitable, but I'm sure there are people closer to you who will know.

bronto64 · 26th April 2004, 08:14 PM

hi, thanks, i go for this 8k ohms 4 y8 ohms output (is right?). Another question, in power supply is better tube or diodes?, any tube (5u4, etc.) or the tube in the schematic is the only i can choose. Is so important than the output trafo or no .
Thanks, Federico

fdegrove · 26th April 2004, 08:27 PM

Hi,

Quote:

Another question, in power supply is better tube or diodes?, any tube (5u4, etc.) or the tube in the schematic is the only i can choose.

If you want to copy-build the Leak TL 20 as you posted you'd better stick with the 5AR4/GZ34 rectifier as shown, otherwise you'll need to change too much.

In general most people building and enjoying tube amplifiers prefer to use tube rectifiers for mains rectification.

Cheers,

25th April 2004, 04:14 PM	#21
EC8010 diyAudio Moderator Emeritus Join Date: Jan 2003 Location: Near London. UK	The decision about whether to use feedback, or not, can be made after the event. The important choice is the output transformer. Valve amplifiers stand or fall by their output transformer. Shipping iron from the UK to Argentina is probably not economic (so how come we buy your corned beef?). I imagine something from the Hammond range ought to be suitable, but I'm sure there are people closer to you who will know. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

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26th April 2004, 08:14 PM	#22
bronto64 diyAudio Member Join Date: Feb 2004 Location: La Plata, Argentina	hi, thanks, i go for this 8k ohms 4 y8 ohms output (is right?). Another question, in power supply is better tube or diodes?, any tube (5u4, etc.) or the tube in the schematic is the only i can choose. Is so important than the output trafo or no . Thanks, Federico