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Old 23rd September 2011, 11:22 AM   #21
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Location: Alps:Tube amp designs over 150W, SMPS guru.
Those output trannies have arrived for that monster project. One on the bench for a suss out. Of course, a British wound custom Williamson 18 sect design. with a specialised primary...got my work cut out now.

Worth mentioning; time is gradually slipping. Output transformers of this complexity, it's all down to the skill of the person on the coil winding machine; with complex interwinding connections and counter directions, no automation can do this and people with such handed-down-generation skills are now heading for retirement. The question whether a 14 sectioned would be a slight tradeoff than an 18 sect..we'll see.
Total amp weight with reinforced chassis around 55-60 kgs.

richy
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Old 24th September 2011, 09:50 AM   #22
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Quote:
Originally Posted by richwalters View Post
Worth mentioning; time is gradually slipping. Output transformers of this complexity, it's all down to the skill of the person on the coil winding machine; with complex interwinding connections and counter directions, no automation can do this and people with such handed-down-generation skills are now heading for retirement.
And we can only hope that people like that don't take their skills to the grave. It is hugely important to pass knowledge like this on, especially for the next generation of valve enthusiasts.

When the older generation pass on, we are at risk of not keeping this knowledge alive. This is why this site is so important.
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Old 9th April 2013, 10:56 AM   #23
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Default Favourite Tubes/Valves Threads ...

Gee, it seems a shame that this thread has been postless since 2011. Let's see if we rectify (sorry) that oversight right now as the Tubes/Valves forum is (IMO) home to some classic DIY threads. By "classic DIY threads", I mean that these threads show DiyAudio members united in pursuit of a better solution to the task at hand. These threads often illuminate the finer, nobler, more collaborative side of DiyAudio members. So, here, are some of my favourite DiyAudio Tubes/Valves threads ...
#26 pre amp
6v6 line preamp
One more 4P1L SE
4P1L DHT Line Stage
This list would also include "EL84 Amp - Baby Huey" had it not been mentioned in a previous post in this thread. It should also be noted that I have not read every thread in this forum, so there are likely other "gem" threads out there waiting to be discovered. -Edward
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Old 13th November 2014, 02:06 AM   #24
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I must mention two threads that I was involved in a while back. I still find myself referring to them and referring others to them. Both are quite long, but educational for those who take the time to dig in.

6L6GC AB2 Amp

A forum member asked for design assistance on an AB2 amp using 6L6GC's or other similar tubes. There was some initial confusion as to just what AB2 is. By post 90 or so some ideas had been tossed around, but no concrete design had formed. I had been working on a universal P-P driver board, so I agreed to work up a version using octal tubes that would work for his application and a zillion others. This design was really a collaboration of two people on opposite sides of the world, that worked together to come up with a really good amp. I have stuffed everything from DHT's to sweep tubes in mine with excellent results. All design decisions and results are in the thread.



Posted new P-P power amp design

Pete designed a mild mannered conservative 18 WPC sweep tube amp. It was intended for a first time builders, and works well in that regard. I bought a board and publicly stated that I would be disappointed if I couldn't get at least 50WPC. That took about 15 minutes (OPT change and a bit more B+). Over time I succeeded in squeezing 250 WPC or 525 Watts in mono out of Pete's board. I settled on a stable and reliable 125 WPC version, and published the construction details. At least 15 of these were built (I made 3) and all worked good.
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