DTBs 6B4G

What people are working on at the moment
Will
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#106

Post by Will »

Nick and others.

RS stock them, I have a few hundred 1.5KE350CA bidirectional.
If you want some a stamped addressed envolope would be best.
PM for my address.

http://docs-asia.electrocomponents.com/ ... 469a6e.pdf
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Nick
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#107

Post by Nick »

Ok, what a very useful thing. Sounds ideal for just the problem Dave is facing.
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simon
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#108

Post by simon »

Dave the bass wrote:You got loadsa class Simon, you had those turbo-nutter-XR3i-Ghia-GTI 300B's last time i saw ya.

Now thats class innit :D
Fanks geezer! I'm avin it large. :P

Thanks for the explanation Nick. I might try 10uF and see if I can hear any difference.
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Dave the bass
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#109

Post by Dave the bass »

Nick wrote: Sounds ideal for just the problem Dave is facing.
Blimey, they repair ankles too :shock:

I'm impressed already.

DTB
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Nick
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#110

Post by Nick »

Applying 350v to the injury might not repair it, but I assure you it will take your mind off the original problem.
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Dave the bass
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#111

Post by Dave the bass »

Nick wrote:Applying 350v to the injury might not repair it, but I assure you it will take your mind off the original problem.
Kaboom!

You're right...it did.

Nurse.

DTB
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Dave the bass
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#112

Post by Dave the bass »

Komrade DHTski update.

His monster PSU is coming along at a fair old rate of knots. Every break and my lunch time today was spent fettling.

Made up the 2 bridges then assembled the CCR onto heatsinks and soldered in most of the components. Just need to link the pot's up now for each channels adjustment and the PSU will be finished.

The o/ps from the PSU will be approx 300v DC HT, 6.3v AC floated at 38 v DC, and 2 separate adjustable 6.3 volt CC regulated (1 for each 6B4G cathode).

I've not linked or referenced either of the CC outputs to anything or each other. Is that right? The 0-9 0-9 50VA TX is a double bobbin type so each channel is totally independent from one another.

DTB
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Nick
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#113

Post by Nick »

I've not linked or referenced either of the CC outputs to anything or each other. Is that right? The 0-9 0-9 50VA TX is a double bobbin type so each channel is totally independent from one another.
Yep, they need to be floating and only connected to the fillament of the valves.
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Dave the bass
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#114

Post by Dave the bass »

Thanks Nick.

I'll be away all next week so you can have a rest from me :wink: :D ....but I'll be back with a vengeance to start the amp in a short while (unless my ankle starts working again properly and I can go out to play 'wheelies' in which case it'll have to wait until I damage summink else).

I'll try and get some piccies up tomorrow so you can see what I've done so far.

Cheers for all the help so far.

DTB
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Dave the bass
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#115

Post by Dave the bass »

As promised here's some piccies of DHTski's boiler room.

Image

Image

Image

Image

There won't be any progress for a while as I'm out and about for a bit but the amp will be built soon-ish.

Outputs are good, nice controllable swing on the variable DHT heater o/p's. Thanks for the design there NickG, works a treat into various dummy load resistor's.

DTB

EDIT. Just noticed I've spelt 'project' wrong, derrrr!
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Dave the bass
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#116

Post by Dave the bass »

...and anuvver fing. Yesterday afternoon 2 of the 1N55820's went down in the HT BR. I have no idea why, hence the old salvaged silicon BR.

I need to order 2 1N5820's but it seems daft to just order 2 diodes so I'll wait to see if I need anymore bit's at a later date.

Other than that everything schweet.

DTB
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Nick
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#117

Post by Nick »

Err, Arn't they 20v rectifiers?

I would have thought UF4007 would have been a better choice if its the B+ supply.
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Dave the bass
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#118

Post by Dave the bass »

Nick wrote:Err, Arn't they 20v rectifiers?

I would have thought UF4007 would have been a better choice if its the B+ supply.
AHA! That'll be the reason, I thought they were the diode of choice for the whole supply, my bad as those kewazzy merrycans say :oops:

Look's like I'll have to 'UF' it up , I'll put an order in later.

DTB
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Darren
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#119

Post by Darren »

It's no wonder you've damaged your ankle Dave.... :shock:
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Dave the bass
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#120

Post by Dave the bass »

Darren wrote:It's no wonder you've damaged your ankle Dave.... :shock:
Yeah! I'm writing to The Sun..." Wrong Spec Diodes naffed my ankle" says Dartfords great olympic skateboard hope" :lol:

It's my fault I should have checked before I applied the mighty Weller. I was carried away in the heat of the moment :wink:

DTB
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