The AM Forum

The curves of the 6L6 and 807 have been overlaid. Does anyone have plate curves for the 6146 with 250V on the screen?

Sorry, no curves here.

What I've found between those tubes is the plate voltage they will stand (power output) and the frequency that they will work at.

Up to 30 mHz the 807 & 6146 are pretty much a wash, tho the latter is shorter.

On 160 or 75 RF it all about the same.  The 6146/8298 will go higher in freq than either of them.  It is not as good an audio tube, however.  Ampeg SVT owners found out all about that...

73DG

A 807 has a hard time with efficiency at 10M as well as more prone to neutralization and parasitic problems due to internal construction.

The 807W/5933 is closer to a 6146 in that regard.

The curves you want are right here

http://tubedata.tigahost.com/tubedata/sheets/020/6/6146W.pdf

I thought the 807 and 6146 were much alike but this curve from that source looks very different.

807W What is going on here?

Patrick,
           An 807 is basically a 6L6 with a plate cap to allow for higher EP and a little bit of shieldibg around the grid leads for RF stability.

The 6146, however is a totally different animal basically designed for RF amplifier service. It has better shielding and can handle much higher voltages than a 6L6 or 807.

The 6146B is another totally different animal redesigned for a grunt more plate dissapation and AB1 SSB leanyour service. And still be able to replace the plain old 6146 in MOST applications.

While the RCA 6146B had some improvements for AB1 its primary market was land mobile FM and in direct competition with the Amperex 5894 family and a few GE Compactrons in the power race. Moto was likely the largest customer in various custom numbered versions and during the transition days of 6 to 12V electrical systems.

whaddya use to make the curves??

OK, so the 6146 does not belong in this set. What else is like a 6L6 o 807? never mind the 7027..

making the curves:
view datasheet, zoom curve to largest displayable size, alt-printscreen, save to bitmap, increase size to 3000 pixels wide to reduce errors, calibrate pixels per mA and pixels per V for each axis, resize all to arbitrary standard pixels per Ma and pixels per V, increase contrast to reduce individual color count (in the gray scale) invert colors for black background, remove all colors but one (different for each chart), saturate color, increase contrast again to reduce depth to one color and black, save bitmaps, open coarsest one 'new' in paint, superimpose finer one over coarser one, save to present format. upload. It could be automated but many steps require careful judgments.

What are you trying to do?  Building or just wanting info?

The 5881 is a 6L6WGB more-or-less.

The 7581 is a glass 6L6GC sub with zero-bias build.

The 1614 is metal transmitting version of the 6L6.

73DG

Lets add on the 6BG6, 5932, 1622, and the European KT-66 to the list..

http://en.wikipedia.org/wiki/KT66


 Also, I find it rare to see detailed theory behind the manufacture of a vacuum tube. Here is Tung - Sol Lamps Works, INC. touting their freshly released 5881:
http://www.the-planet.org/pdf/ts5881s.pdf

They use triple getters, gold plated G1, upped G2 dissipation to 3 watts, and upped the Pd to 23 watts...


Oh, how about the 6AR6?
http://www.the-planet.org/pdf/6AR6.pdf
Looks a lot like 5881 except the base is different; pin 3 (plate) all by itself for more insulation.

Jim
WD5JKO

The Western Electric 350A and the 350B.  6L6G and 807 respectively.

73DG

Another interesting tube is the 1619. It's basically a 6L6 with a 2.5V directly heated filament.

The classic radio types use them triode connected to replace 45's and 2a3's.

There is a guy out there that sells an adaptor so no socket change is needed.

I think the 1624 is similar.

807 has long internal leads so tend to make TVI. My dad wore his foot out banging on the floor whenever I fired up on 15 with my first 807 rig.

The 6CD6 et al is an octal-based beast, different pinout but in the family.

200mA @ 700V.

73DG

6550, 4D32

I was just asking that exact question in my search window.I have a rf amp I built with 6l6 EH tall boys. (a pair in parallel with a 6l6g driver) I have also an amp I built with a single 6293 (pulse transmitter HD version of the 6146B) I have another 6293 currently warming up my DX60B . I could put the 6146B back there and parallel the other 6293 in the single amp I made easily.
I also have an arc 5 transmitter with a pair of 1625s (12v 807s)
I know the 6l6EH tall boys can stand well over 600 volts.
As can the 6293 tubes and the 807s.
So in reality pushed to the same voltages at say 40M not really that much difference? Am I reading this right?
I know the folks worry about plate pin arc over on the 6l6s but I have had these at 740 v and no problems (except arcing on the morse key like my tig welder does. ) They are quite a big tube in fact. Perhaps I should give them a good push and see what they will actually do.  

And that beautiful shortie, the 6AR6/6098.

Anybody tried the KT-120 yet?

Not here, never had one in my hand. What is that, a super-6550/KT-88? Tell more!

Is the 807W the one with the shorter bulb and shorter leads up to the elements from the pins? 

Yup
http://tctubes.com/tung-sol-kt120-tubes.aspx



Another Yup plus a more rugged base.
http://www.ebay.com/itm/Radio-Tubes-5933-807W-807-Sylvania-NOS-/350691458847?pt=Vintage_Electronics_R2&hash=item51a6d6ff1f

Thanks