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Old 27th December 2010, 05:11 PM   #12
M Gregg is offline M Gregg  England
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Default Loose tube bases.

This seems to work well,

Loose Tube Bases

I used clear nail varnish worked quite well on 6L6G Brimar.
Thank's Ty_Bower.

Regards
M. Gregg
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Old 27th December 2010, 05:36 PM   #13
igaar is offline igaar  United States
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Finger nail polish! I use that to fix tears and glue down old spiders back to the magnets as well in speakers that have seen better days, any color will work by the way. Something else that could be good for tube bases is "slow drying super glue" it can be bought at the hardware store like Ace or one of the other chains.
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Old 5th March 2011, 11:56 PM   #14
kevinkr is offline kevinkr  United States
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Zigzagflux's thread on FFT measurements performed on his system: http://www.diyaudio.com/forums/tubes...eview-plz.html for persistence and methodology. Quality of all responses is also excellent.
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Old 2nd September 2011, 04:13 PM   #15
richwalters is offline richwalters
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SOme wondered how that that BiG 200+200W parallel p-p project is going; pic of the business end. It may look horrendous but it's in order. In all about 9 months work in evenings the 100KHz SMPS taking up alot of development time. Some wiring needs tidying up but in the most part the 750W SMPS (within square can) with dual voltage boost power supply runs as expected as do the supplementary power boards; all with hot logic switching and watchdog detection, with programmable stage USB interface.
This is systems engineering complexity, so this project isn't for first timers nor beginners as considerable RF experience is required. The power amp circuit is remarkably basic; capable of bridge mode operation but it's the safety aspect of the very low impedance power supply draws attention to protection. Many don't like SMPS in power amps supplies; the advantage of excellent regulation is a real plus for dynamics.
Some features:-
AC soft start; duff cable and brownout jerk hiccup; 360V intermediate driver stabilised B+; logic controlled auto switching B- with hi & lo power with programmed B+ droop for MI; auto cathode current monitoring (important in bridgemode); large tolerance AC operation; wideband input transformers; DC front end heater; watchdog bias and overvoltage failure protection. Channel separation guaranteed -70dB at 15KHz; hi power thd 0.1% at 200W & lo power 0.05% at 35W.
This amp represents a considerable investment in old and new concepts.

Next to come; in a few weeks time, the complete power running spec with photo.

richy
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Old 2nd September 2011, 04:39 PM   #16
SY is offline SY  United States
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I am sincerely impressed!
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Old 23rd September 2011, 10:22 AM   #17
richwalters is offline richwalters
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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, 08:50 AM   #18
Brouilly is offline Brouilly  United Kingdom
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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, 09:56 AM   #19
harrylime6 is offline harrylime6  Canada
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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, 01:06 AM   #20
Tubelab_com is offline Tubelab_com  United States
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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.



http://www.diyaudio.com/forums/tubes...ight=6l6gc+ab2

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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