Mellow Monster

[planet10]

hey Dave - here's what I had in my email box from 2007 - can you make out enough to do a drawing?

I already did a drawing sufficient to generate the 3D. Probably only needs dimensions and minor details.

BTW: the article has an error in (at least) one of the panels, so it may not fit into one sheet of 4x8.

dave

 

[freddi]

it had a MISCO - -your 3D rendering looked sharp

 

[freddi]

hey p10 - did you determine which FR might fit MM's characteristics? (FE206E?) - I just bumped into the October 1962 issue of Popular Electronics in my pile. I remember a cool guy long passed away who said he built one in the day.

 

[planet10]

No i didn't. I was just interested in the folding.

dave

 

[freddi]

thanks - its Olson folding is cool

 

[Qtonian]

Mellow Monster Speaker

I built quite a few of these in the early 70's, the college days. The efficiency was amazing. I think I have the plans in the basement.

 

[Paul Joppa]

When I was a teen, my father helped a friend of his build one - probably in '62 or '63. The friend soon stepped up to Dyna gear for stereo, and I inherited the Monster. It had an 8" Wolverine LS-8. It was my first system, with a home-brew amp and a Heathkit FM tuner inherited from another friend of my fathers who couldn't get it to work. (I fixed the tuner - one bad solder joint!)

 

[freddi]

there ought to be drivers today which are a good fit parameter - wise. It would be nice to see clear plans and any notes not published in the magazine article. (link below)


https://worldradiohistory.com/Archive-Poptronics/60s/62/Pop-1962-10.pdf

(any previously unpublished Karlson history is welcomed too. I think there's a paper associated with the later Karlson Twelve which told how many holes to drill in the port panel for a particular speaker)

 

[freddi]

btw - the article - the scaling of pages is uneven but think I saved decently large for the plans

 

[Cambe]

Thanks Freddi and Dave. Cool looking speaker! Wish I had a pair of old pioneer B20FU20's or maybe something newer like the SB20FRPC30-8 or 4 ohms version might be suitable.

 

[Edu cbm]

Just to enrich this post with more information about mellow monster I am sending the images I found in this link:

https://hifihaven.org/index.php?threads/the-mellow-monster-and-a-lil-coral.8894/

 

[planet10]

I see a Coral Holey Basket in one of those pics, what is the other?

dave

 

[grindstone]

Kinda looks LE8-ey to me (?)

 

[planet10]

More than a few Japanese drivers looked like that, first guess would be a Coral.

dave

 

[Pepe]

The Coral/Visaton had white surround, not black as in that picture.
Looks more (or exactly) like JBL le8

 

[Paul Joppa]

Fostex FX-200?

 

[GM]

Thanks! Didn't know there was one.

 

[Pepe]

Fostex stoppad producing the fx200 some time ago but kept on offering the smaller driver from that series called the fx120 to the public. F120a and f200a I think are still available allso.

 

[planet10]

producing the fx200 some time ago

Sometime arond 2000

dave

 

[rclcomputer]

I love the Mellow Monster, was given a few years ago and didn't do much with them. Decided to revisit them over the last few weeks and make some changes. The outsides are a little rough so the next project is to veneer them.