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Old 27th September 2002, 01:11 PM   #11
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Default 300B

Hi guys,

Seems to me you all were looking the other way when taking a glance at this circuit?
Have you seen the suggested tubes for the first stage?
For a diy project I would not design anything using those unless I had a dozen of them already.
If your preamp has the gain to drive the 6SN7,I would leave the input stage out.

Just my 2 cents of it,
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Old 27th September 2002, 01:53 PM   #12
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Default Re: 300B

Quote:
Originally posted by fdegrove
Seems to me you all were looking the other way when taking a glance at this circuit?
Have you seen the suggested tubes for the first stage?
For a diy project I would not design anything using those unless I had a dozen of them already.
If your preamp has the gain to drive the 6SN7,I would leave the input stage out.
Frank,
I agree totally, it's not a practical tube for most people, but I'm amazed what people have sometimes. I presumed he had some, as no questions were asked about it, and it's not in the component list.

Personally, I wouldn't use either the 327/56/76 or the 6SN7 and would select the single drive stage so a preamp with sufficient gain and drive to swing 4V out, ie most of them would drive it to full gain. Almost every system I've ever seen has too much gain.

Cheers
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Old 27th September 2002, 02:00 PM   #13
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Default 300B

Brett,


Yes matey.
And a BIG hats off from me for all the stuff you posted so far!
You're as down to earth and knowledgeable as I can hope for.
Very good work,Brett.

Keep it up,
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Old 28th September 2002, 12:39 AM   #14
Colt45 is offline Colt45  Serbia
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Quote:
Originally posted by Brett

It might be worth looking at the Chinese <a href="http://www.diyhifisupply.com/tube_supplies/china_nos_tubes.html">6N8P</a> from Brian at www.diyhifisupply.com. I haven't heard them as none of my gear uses 6SN7s, but I've read a lot of good reports on email groups about them. Plus they're cheap, tested and traced, and Brian is good to deal with. More than good enough to start with.
neat, chinese tubes with russian names..
6N8P is latin spelling, cyrillic spelling is 6H8C, if it matters to ya.
6N9P/6H9C is 6SL7, btw.

I've got some russian tubes coming from my friend in lithuania.. it will be neat to try them.

an intresting one is YO-186 (UO-186).
4pin DHT, 4v 1A heater. 250v plate @ ~50mA.. 15w Pa.

It will be intresting to try out..

also getting russian variants of the 807 (G807) & EL84 (6P14P)... I'll put up a site about them, when I try them out. If anyone is intrested, that is.. hehe
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Old 28th September 2002, 01:16 AM   #15
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Quote:
Originally posted by Colt45


neat, chinese tubes with russian names..
6N8P is latin spelling, cyrillic spelling is 6H8C, if it matters to ya.
6N9P/6H9C is 6SL7, btw.

I've got some russian tubes coming from my friend in lithuania.. it will be neat to try them.

an intresting one is YO-186 (UO-186).
4pin DHT, 4v 1A heater. 250v plate @ ~50mA.. 15w Pa.

It will be intresting to try out..

also getting russian variants of the 807 (G807) & EL84 (6P14P)... I'll put up a site about them, when I try them out. If anyone is intrested, that is.. hehe
Please post your findings. I'm interested in the EL84 as I use them, the 807 because I have dozens looking for a use, but especially the YO-186. All I could find via TDSL was the Russian CityRadio site with a pinout.
<img src=http://cityradio.narod.ru/spr/tubes/russian/short/pics/uo-186.gif>
Do you have any more info on it including prices? All DHTs are pretty linear, so it might make a nice 3W SET or 6W PP amp. The op point indicated there is similar to a 2A3/6B4G, with a bit less bias, so I'm (WA) guessing it has a bit higher u.

Cheers
Brett
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Old 28th September 2002, 01:32 AM   #16
Colt45 is offline Colt45  Serbia
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All i could find out about it was what youve found

the YO-186 isnt available at the store he normally gets tubes from, but I assume some store out there carries them.

He found it in his box o' tubes, and I said I'd give it a shot.

807 is alot like a 6L6GC.. but It looks cooler, and it can handle RF better than 6L6.

I think I'll try the 807's in AB1, if I can round up the iron for them. (im not a rich man. not even close ).

the EL84's are cheap as heck. about $2 USD.
i think 807's run about $5.

I want to try the 6C33C in OTL, but theyre $10 a piece, and I dont really have that to spare at the moment..

heck, I still need to make my 6080/6AS7 OTL. I sure like putting things off. (and having ten projects going at once).
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Old 28th September 2002, 02:42 AM   #17
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Hello,

Wow, the response is really good! I might try the ElectraPrint transformers, ( waiting for e-mail response ) and was wondering if any one has used these in a project?

Also, I like the idea of seperating the power supply from the amplifier, but how is this done? I mean, what kind of connectors and cableling are required to achieve this?

Can copper plate be used for the top of the chassis, instead of aluminium? or does this introduce RF signals?

BTW, I have about 3000 vacuum tubes in my garage rafters. Just thought you'd like to know. Of course no 300b's and lot's of old tv tubes. Not cataloged, some good ones in there though. Maybe some day

Paul A.
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Old 28th September 2002, 02:49 AM   #18
Colt45 is offline Colt45  Serbia
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Quote:
Originally posted by maybeim
Also, I like the idea of seperating the power supply from the amplifier, but how is this done? I mean, what kind of connectors and cableling are required to achieve this?
Octal umbilical cord looks/works well.

basically have an octal socket on each chassis, and run a cord with an octal plug on each end between them.

Quote:
Can copper plate be used for the top of the chassis, instead of aluminium? or does this introduce RF signals?
Don't think it will be a problem. I like the look of copper..
remember to varnish it or something, or it will go dull..

Quote:
BTW, I have about 3000 vacuum tubes in my garage rafters. Just thought you'd like to know. Of course no 300b's and lot's of old tv tubes. Not cataloged, some good ones in there though. Maybe some day
Throw some my way

Most any tube can be semi-useful, depending on how bored you are
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Old 28th September 2002, 04:19 PM   #19
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Hi,

I am a newbie and have chosen this amp for my first real project. So far, I have acquired Hammond 1627se opt's, Angela mains, Hammond chokes, sockets, several sets of NOS 6SN7s and 5U4Gs, big can caps, signal caps, big resistors and a pair of Welbourn custom walnut and aluminum chassis. Should have the rest of the parts over the next few weeks. Am really looking forward to doing this build.

In the beginning, I contemplated a complete kit (ie Billie, Bottlehead). If I had, then I would probably be finished and listening by now. However, I have really enjoyed sourcing the parts. I lucked up and found the 1627s unused on eBay, as well as the chokes. Bought the chassis from www.welbornelabs.com. A couple of friends turned me onto the 6SN7s and the 5U4Gs. Bought the mains transformers and caps from www.angela.com. Various other parts from several other suppliers.

I am almost ready to cut metal and am using Visio to do my chassis layout. I ordered and received some Unibits for the hole cutting on a drill press. And am about to prep the walnut chassis.

My background consists of rebuilding my vintage Fisher equipment. That stuff is cool too…

Anyway, you can get most (if not all) of the parts from www.angela.com if you don’t what to source other places. They seem to have pretty good prices.

Btw, I stuck strictly to the circuit. If my ears tell me, I my mod later..

Best of luck,

ck
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Old 28th September 2002, 08:20 PM   #20
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Default RUSSIAN TUBES

Brett,

My estimation on either stock of EL84/807 is roughly at 75.000 units each/year.
Pricing will depend on you being an individual or company but will always be more a matter of quantity ordered.
Any tube being manufactured to order has a minimum of 10.000 units/year.
I should know.

Rgds,
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