marting
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Posts posted by marting
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It really is amazing. I tried this when I lived alone in a small apartment. I had just built my Bottlehead Paramours. I had a pair of 80's Kenwood 3 ways. I sat down to listen to the 'Round Midnight soundtrack with my cat in my lap. The sound filled the room. I was really impressed. But what really surprised me was when the first tune with a vocal came on the cat sat up and looked to see where that other person was in the room. He thought someone else was in the room with us.
But, as you say, it's not always practical to use this set up. I don't have the space in my office or the bedroom. In the living room my wife and son would not want to be walking around the speakers and stepping over wires.
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I've built a couple of Bottlehead kits (Foreplay and Paramours) that worked the first time I plugged them in. Still using the Paramours with no problems so I guess I did something right.
I would definitely consider building crossover kits. I like saving money and doing the work myself.
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I haven't had any of the carts you mention so I can't compare the sound but I had one before I moved up to a DL-103R (and head amp). I liked the DL-160 a lot and it worked well with the moving magnet phone stage I was using then. It has been discontinued though so you will likely have to look on the used market.
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I've noticed this too.
The mono pressings of Time Out are MUCH better than the "stereo" versions.
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I just had a thought this morning (I know, dangerous). My birthday is coming up next month and I know my wife is going to ask me what I want. I always have a hard time with that question. But I could ask her to have the 800c that's sitting in the closet restored. I realize of course that it might take longer than a month for the work to be done. I can be patient. What are my options? I haven't looked into this recently so I don't know who's still doing this kind of work.
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G'Day!
Be sure to have the sides of the doghouse made from 25mm plywood. The top and especially the bottom don't really need to be that thick. Both are braced by the doghouse. Be sure to preserve the inside dimensions of the bass horn, letting the extra thickness of the sides make it wider on the outside. This mod mimics the La Scala II and stiffens the sides. The stiffer sides don't vibrate and it removes the 200 to 250 Hz response bump.
You can improve the upper range of the bass horn (make it smoother and go higher) by adding corner reflectors to the back outside corners. I did the calcs, once, but I've forgotten the exact dimensions. The reflector has to be set on a 45 degree angle and is about 25mm from the 45 degree surface to the back of the corner. If you do it you should also make the crossover for the bass horn to the squawker 2nd order (12 dB/octave). That crossover slope will reduce distortion in the squawker at higher volumes, too.
Would a diy Belle need to have the sides of the doghouse thicker also? The panels are smaller. Would they resonate less? I just got a new table saw so Oak Belles are on my list of things to do for 2009!
Martin in Austin
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Great post!
Every once in a while when I hear the Guess Who's "No Time" I can actually smell the smell of my mother's basement as it smelled in the summer of 1970. Anyone else have music trigger an olafactory response?
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Here are a couple of pages from JBL Pro catalogs.
http://www.lansingheritage.org/images/jbl/catalogs/1974-pro/page20.jpg
http://www.lansingheritage.org/images/jbl/catalogs/1976-pro/page21.jpg
These are listed as 6010B models. I couldn't find anything on a 6010 or 6010A. The 1974 catalog picture looks just like
a pair I saw on Craigslist recently. They were listed as 6010s. I passed on them because of the limited frequency response.
Hope this helps.
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You can also get the whole run on CD on eBay from Joe Roberts.
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I know of three: Sinatra Basie, It Might As Well Be Swing, and Sinatra at the Sands. I have the first two and I've heard people say Sinatra at the Sands is very good.
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Do those use the same crossover values as the other horn?
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Bob,
Did you ever find a suitable replacement for the Pyle Pro Cornscala horn?Martin in Austin.
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Did a little more listening last night but ran into technical
difficulties with my TT. On CDs the Heresys sound great.
I'm really enjoying that. But I'd been listening to the SACD of
Time Out and for giggles I threw on an old thrift store vinyl copy
(stereo). All of a sudden the instruments switched sides! I
checked the cables but everything was hooked up right. Then I got
out my reading glasses and a big maglite to look at the
cartridge. The leads were hooked up exactly backwards. I
just got this table (used) a month or so ago. I've been a bit
disappointed with the sound. Although I checked all the settings
I never looked at the cartridge clips. Then while carefully
re-arranging the leads I pulled the lead off the left ground
clip. DOH!! So it's 10:30 already but I don't want to leave
it that way. Out comes the solder station and all the related
gear. I got it all soldered back together (man those wires are
tiny!). Although I should have gone to bed I had to listen to it,
right? Put the Brubeck back on. Now that sounds much
better! If things aren't too crazy tonight I hope to spin some
more vinyl but like I say, it's sounding very good playing cds.
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I installed the CT125 tweeters and finished the crossover mods last
night. I used GE motor runs like BEC supplies for rebuilds.
I used a 4uF on the tweeter and the stock 2uF on the midrange. I
also put a 500uH coil on the midrange to roll it off around 4500.
It was pretty late so I didn't get to listen much but I did play a few
tunes. I didn't notice the change in high frequency so much as
the difference in midrange. Background vocals seem much clearer
now. That's what really stood out late last night.
I also have to say that my original intention was to leave the Type E
networks alone and build new replacements. I collected all the
parts for that while planning my Cornscala project. I really had
trouble getting my brain around wiring the terminal strip. In the
end I set the new parts aside and modified the 1980 Type Es.
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I'm hoping to get the new crossovers built this afternoon if I can get our 3 year old down for a nap.
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Glad to hear that you like the new tweeters. I've got a pair (and new caps) for my 1980 Heresys. I plan to do the mod that lowers the crossover for the tweeters and rolls off the high end of the midrange. Have you tried this or did you use the stock caps?
Martin.
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I work in a college library but we didn't have the proper index, nor
the back issues of RS. However, the public library did. The
issue is Sept 26, 1974. Tanya Tucker is on the cover and in the
top left corner it says "Special 1975 HiFi Issue". The title of
the article is "I have been to the city of Hope and my ears are open
wide". The library had the actual issue in a bound volume.
I made some large photocopies but I doubt they'd scan very well.
Martin.
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I got mine from Parts Express.
http://www.partsexpress.com/pe/pshowdetl.cfm?&DID=7&Partnumber=264-322&CFID=65390&CFTOKEN=74875329
These are set up for a three hole, bolt on horn like JBLs. You
can line them up and drill an extra hole in the plastic adaptor to
match the two holes in the 511.
Martin.
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Just a question on the value of that inductor to roll off the top of
the midrange. Is 500uH the same as .5mH? I thought that was
right and ordered these:
http://www.partsexpress.com/pe/pshowdetl.cfm?&DID=7&Partnumber=255-230&CFID=65390&CFTOKEN=74875329
Did I get the right thing?
Martin.
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Anyone know the correct part number for a replacement diaphragm for a K66E midrange driver? I've got a pair of K66Es that I got off eBay. One has an 8 ohm voice coil. The other has a 16 ohm voice coil. I'd like to replace one or the other so that they match. I found someone on eBay who has some 2" diaphrams that look like they might be right but the seller does not know what they fit. The part number is 164016. The eBay item # is 5866270472.
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Those dates are good for me, esp. if we meet in Austin. I can bring a beat up pair of 1980 Heresys. Would we be swapping amps around too? I've got a pair of stock Bottlehead Paramours (2A3 Parafeed) that I could bring. I've ordered the iron upgrade for them. Not sure it'd be installed by then but you never know.
Martin.
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I second the Canned Heat and suggest the classic GD tune Truckin'.
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JWC - I was inspired by your posts and Bob's test box. I
downloaded the Word file that you posted describing your build. I
will definitely use some of your ideas. I may also build
something very much like Bob's Box. I scored a pair of 15" LWE
woofers. These look an awful lot like K33s but are supposed to be
able to get up to 700Hz. I'm thinking of putting them in Bob's
Box with the horns from a Heresy on top. We'll have to wait and
see. I want to do the Cornscalas first. Right now I have
everything except the wood and a couple of caps, oh yeah, and the free
time to build them. [
] I've got a wife and a three year oldthat take up a lot of my time.
And thanks everyone for the reassurance about storing the woofers. I have them in boxes face down.
Martin.
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My current plan is to build two boxes for each speaker with the K33e in
the bottom and the K77 and k55 in the top. I'm thinking I'll use
a little spacer between the two boxes like on an Altec Model 19.
The 19s have an open space between the two boxes, effetively making it
one box. I'll have the bottom box closed. I think I'll leave the
back of the top box open so that I can fool with the crossovers.
For the midhorns I'll be using a pair of Altec 511s that I got on eBay
really cheap.
Martin.
Belles SOLD
in Garage Sale
Posted
If they were anywhere in Texas I'd take 'em. Someone will want those soon.