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Guienever tube rolling [message #31481] Fri, 25 November 2005 16:16 Go to next message
2wo is currently offline  2wo
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Registered: May 2009
Baron
I have been playing with some other tubes in Guienevere. I have fallen out of love with the 5687, we’re still good friends but in this application I think it is a bit "hard" sounding and the pin out bugs me.

By shifting over to the "conventional" pin out I tried a pair of 6n6p, which are pretty close electrically but uses the same pin out as the "usual suspects" . So far so good.

But hey why stop there. We already have "dial a milliamp" ( must revue the archives for Colin’s trick current set up) . For bias I have, 3, 1.6 LED’s in series and for now, I just twist 1 or more of them till there Leeds touch to short them out to lower the bias. I am working on a more elegant solution that fits my little board. Maybe an IC socket or a jumper setup.

With this I can try most any twin triode with a 9A pin out, with heaters wired for 6v, 9AJ and more, just check you'r RC30.

this includes the 12a*7 and 6922 clan.
6fq7 anyone?

That’s a lot of tubes…John


5687 flavours [message #31482 is a reply to message #31481] Fri, 25 November 2005 17:12 Go to previous messageGo to next message
colinhester is currently offline  colinhester
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Illuminati (3rd Degree)
Are there different varieties of the 5687 that are direct plug-ins? I thought there was an article in VTV that profiled the 5687. I'll go back and look.....Colin

Re: 5687 flavours [message #31483 is a reply to message #31482] Fri, 25 November 2005 17:31 Go to previous messageGo to next message
2wo is currently offline  2wo
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Baron
What I mean is that the 5687 has a different pin out then most 9 pin twins…John

Re: 5687 flavours [message #31485 is a reply to message #31483] Fri, 25 November 2005 17:38 Go to previous messageGo to next message
colinhester is currently offline  colinhester
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I remember the pin-outs are different than the normal 9-pin configutattion, but I thought the were direct plugins for the 5687.......Colin

if you've gone to 6H6Pi pin-out... [message #31486 is a reply to message #31481] Fri, 25 November 2005 18:07 Go to previous messageGo to next message
PakProtector is currently offline  PakProtector
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Registered: May 2009
Illuminati (2nd Degree)
Then you'll be able to run 6CG7's as well. Also 6BQ7/6BK7 but those have mu of ~40 instead of the 5687's 16.

I have a sack of 6H6Pi tubes. GOt those wonderful things for $2.45 each. They are a nice alternative to the 5687.

I can't say I've ever found the 5687 hard, save at very low current like 2 mA or so. Usually I find it a bit to soft...heh-heh-heh, audio language and at best small computer sound systems to sort it out.

I am sort of stuck on the 12B4, and wish I could have one like it with about mu=3.
cheers,
Douglas

Yep, to the RC30... [message #31487 is a reply to message #31485] Fri, 25 November 2005 21:05 Go to previous messageGo to next message
2wo is currently offline  2wo
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Baron
Starts on page 594...John

Re: if you've gone to 6H6Pi pin-out... [message #31488 is a reply to message #31486] Fri, 25 November 2005 21:27 Go to previous messageGo to next message
2wo is currently offline  2wo
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Baron
I have a hard time with the Russian to eastern alphabet . I think we speak of the same tube, at least that is my read of the data sheets.

Yes I have a pair of 6fq7/6cg7 that are next up.

I make no claim to be a "golden ear" I takes me some time to decide if a change is better , or different …John


yes.... [message #31490 is a reply to message #31488] Sat, 26 November 2005 05:12 Go to previous messageGo to next message
PakProtector is currently offline  PakProtector
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Illuminati (2nd Degree)
It is the same tube. On the glass it says 6H6, as does the 6H30 which does go by that designation, unless we translate it first....

I am going to build in a bit more gain( or a bit less ) so I can use either a 12B4 or a cathode follower. Right now I am right in between.
cheers,
Douglas

put it in 'H'... [message #31502 is a reply to message #31488] Tue, 29 November 2005 16:58 Go to previous message
PakProtector is currently offline  PakProtector
Messages: 935
Registered: May 2009
Illuminati (2nd Degree)
says the car salesman to Homer as he drives away in a little eastern euro car. I just realized how funny it was.

Put in in 'N'...

cheers,
Douglas

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