Buy EF12 vacuum tubes online, in stock and ready to ship! Find reviews, data sheets and specs to upgrade your tube amplifier. The EF12 is a pentode designed for RF or IF amplification at HF or MF. The wide metal tube envelope is 36 mm in diameter, and excluding the footless base . I found one blurry schematic for use with an EF12 tube, of which I have a a cleaner/readable copy of the EF12 schematic, validation that this.

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I’ve built a couple of mics before, but not from scratch.

Gus Member NJ Posts: Started by chefducuisine The Lab. Canon provides a usefel table with the extension tube that lists the change in minimum focal distance so that it can be used to pre-plan shots.

It also allows autofocus to function normally. See any errors on this page?

Other than that, the item is a very well designed and constructed Canon accessory that works flawlessly. So I figured I’d go that route, as those two make nice mics. On the ‘to do in ‘ list.

Rated 5 out of 5 by Anonymous from Great on the Canon lens I bought this and the EF 12 II for use in photographing butterflies and am extremely happy with the results.

DiMaggio encouraged photographers to carry this highly portable extension with them at all times. Light metering works well but autofocus needs to be turned off.


As we all know, the photographic world is full of sf12. Place your order by 5pm Wed Jan 2 and your order will ship the same day. We should all have our own logos and badges, IMO. Voltages are different its true. On the included comprehensive spec sheet this lens was not listed and I assumed ev12 was because it was a fairly new lens.

I certainly cannot afford a real VF I do wish that the tubes were slightly less expensive Canon or Kenko. However, the EF12 is or at least was at one time the “2nd place” tube of choice for Wagner and Grosser, according to what I read on the internet.

January 05, Very likely it’s also Tubf like in Max’s kit, and the resistor looks like 3. Enter new zip code to refresh estimated delivery time. I first tried out this macro extension tube on an Tubr ultra-wide zoom.

Peluso Microphone Grade Vacuum Tubes

Nice odd looking EF12 tube mic on german ebay. It’s the only part I have.

There are other possible lens combinations but these two give me a shot at something less than macro. I’ve done a fair amount of reading, and everyone has a passionate opinion about tubes to use in “U47 Inspired” mics.

EF14M replacement tube

June 27, Biasrocks on January 05, They seem a bit overpriced for what they are – spacers between the lens and body. I don’t believe, however, that the tube can or will replace a good macro lens. This extension tube is solidly built and does not introduce any flex between the camera body and lens.


Ribbon microphone services http: Did you have a chance to compare it in a ‘shoodoud ziduation’? Before my membership was approved, I lurked for a long time and I’ve read many wonderful threads here, using the search function, about DIY Ualike microphones. Hi there, For what i know of the ef12 in a u47, it has a reduced sensitivity and diferent heaters voltage. Next day, trying out the extension tube with the EF-SI found that a focused image was impossible to achieve optically with the zoom set at less than approximately 50 mm, but at the longer end of the zoom range there was no problem in getting a perfectly focused macro image.

I like to shoot closeups but at this point don’t want to spend the money on a dedicated macro lens so got this extension tube and have had it for a week.

Use it mainly with my nifty fifty lens and have tried it with my mm f4 lens. Build quality is excellent and product has a very solid feel. Yes, the guys at Flea decribed the ef12 as being a litlle less agressive than the ef14 so more hi-fi is probably the best definition.

Update Unrecognized Zip Code. Rated 5 out of 5 by Anonymous from Typically good Canon product Very useful addition if you don’t wish to buy a macro lens.