ef86 sockets

[mark enger]

Anyone ever try something like this, I have rubber that would work at my shop, and i have some waffer 9 pin sockets, what do you guys think? mark

[Blackburn]

I saw this vid a while back that looks like what you're talking about. Wired up an 86 in an amp once and didn't have any issues with it on the speaker cab whilst I played. No head cabinet either, just the chassis. It was a Mazda EF86 made in France.

https://www.youtube.com/watch?v=BXAvG5zUBKU

Too bad the damn thing cracked when I pulled it out of the socket.

[mark enger]

I've used just normal plain old sockets with ef86 tube with no issue.
but that was for a head style amp and i wanna do a combo for this and im most likely thinking way too much. mark

[Ed Chambley]

I have used O rings with great success. 2 small ones where you mount the socket bolt or rivet and a larger one that fits the base.

[chief mushroom cloud]

I use these
http://www.ebay.co.uk/itm/B9A-NON-MICRO ... 2c52fd2a49

[mark enger]

Looks like what I made chief MC, a socket on a piece of rubber, I'll have to see how it works out mark

[Mark]

https://taweber.powweb.com/store/chassis/chord2.html

Ted Weber does these, I haven't used them and frankly I'd wonder if the springs could react in time to transiences from the speaker. If it couldn't it would be pretty useless. I also wonder about the thickness of the rubber, if it is too thick you might as well have the valve mounted on a steel chassis.

[JazzGuitarGimp]

https://taweber.powweb.com/store/chassis/chord2.html

Ted Weber does these, I haven't used them and frankly I'd wonder if the springs could react in time to transiences from the speaker. If it couldn't it would be pretty useless. I also wonder about the thickness of the rubber, if it is too thick you might as well have the valve mounted on a steel chassis.

Oh boy, springs! It's kind of like having a reverb tank between your speaker and your microphonic preamp tubes

[Mark]

I'm sure you were tongue in cheek about the reverb comment as the springs don't have the length or characteristics. Personally I'd be surprised if either rubber or springs worked.

Is the issue the speaker shaking the cab and thus the chassis shaking the EF86 or is it the sound waves hitting the EF86 glass?

Given that I've had a couple of beers fall off the amp over the years, I think it's the cab vibration that is the issue. The best solution is build the amp as a head and it won't be a problem.

[mark enger]

I cut a piece square of rubber just a little bigger than a 9pin socket and will screw it to the chassis, and the socket to the rubber, so no screws from socket to the chassis, I don't think i could do anything more than that, I do have some ef86s that i know are non micro-phonic from past builds, but i had to sell my genalex z729, it was the granddaddy of ef86s, I did'nt have to do anything to that socket, but that was a head this will be a combo. so im taking a few steps to prevent. i'll let you guys know the results, everythings built i just gotta it wire up mark

[Matt D]

It seems like you need some weight under the socket to properly decouple it from the amp chassis. I've seen some very cool shockmounts in old Tektronix gear where a square of board material was suspended about 1 cm under the chassis with 4 pliable rubber spacers at each corner in place of springs. The tube socket is mounted on the square and sticks up through the chassis. Bolted to the bottom of the suspended square are some heavy steel weights. This keeps the tube platform more stable as the chassis shakes. Make sense?

[mark enger]

That makes sense, somewhat, I'd think as long as the socket is'nt bolted
to the chassis it should be atleast better than the socket being bolted to the chassis, Does that make sense? I've had a bunch of idea's but im thinking this will work, luckily i have some nice vintage ef86 to sort through, I'll post some pix here soon mark

[Masco]

I've been using some of these high damping ribbed grommets w/ low cap. lbs. http://www.mcmaster.com/#vibration-cont ... ts/=o25w5m
I install a small metal spacer in the middle, just tall enough so the mounting screw can't compress the grommet. I wish the mounting flanges on the sockets had bigger holes, I'd put some kind of grommet in there as well.
Here's another interesting one I've run across on the net:
http://www.tubemonger.com/TRIODE_FLIPPE ... lipper.htm
Don't know if this is a review of the above:
http://www.tnt-audio.com/accessories/vi ... pt9_e.html

[Masco]

Anyone ever try something like this, I have rubber that would work at my shop, and i have some waffer 9 pin sockets, what do you guys think? mark

Are there instructions that come w/ the drawing. I'd like to know if the socket is supposed to be mounted 90 degrees from chassis mount? I think that would be better.

[10thTx]

Cheap and effective. Used this for a 5879 pentode. Cut from a silicone pot holder.

With respect, 10thtx