Heresy w/Crites tweets

[DizRotus]

Since our older son has decided to join the USAF rather than start his third senior year in college, he brought home the H/K 430 and Heresy system he's been using. <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

In anticipation of the return of the Heresies, Id ordered new caps from BEC to refresh the 1982 Type E networks. I'd also purchased a pair of Crites tweeters from Allan Songer.

Before changing anything I hooked them up and listened to familiar music. I then swapped the caps in one speaker only. With the preamp set to mono I used the balance control to switch between the stock Heresy and the one with new caps. The difference was obvious. The new caps beat the 24-year-old caps easily. Then I replaced the caps in the second speaker and listened to them in stereo for awhile. They sounded very good,

Next, I swapped the K-77M for the Crites tweeter in one speaker and compared the two in mono as described above. The difference was noticeable, but not as noticeable as the difference between the caps. The other Crites tweeter was then put into the other Heresy. There is an improvement in sound. So far, I notice it most with percussion, especially brushes on cymbals and drum heads.

Tomorrow Ill try Alnico K-77s to see how they compare to the Crites tweeters.

[Daddy Dee]

DizRotus,

Thanks for the review. That's some work to set that up. Looking forward to hearing your take on the alinco comparison.

[chops]

Since I have been running Bob's CT125's now, the thing I noticed most about them is that they sound exactly like my alinco K77's up to 12-13kHz. The only time I really notice the CT125's is when the program material has information up to 20kHz. Obviously, this information was never heard with the old K77's.

The CT125's, IMHO are a natural "must have" to extend the top end of the Heritage line while keeping in the stock appearance and mounting. []

[marting]

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.

[DizRotus]

I used the stock value 2uF GE caps supplied by BEC, i.e., the crossover point from squawker to tweeter was not altered.

[chops]

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.

I plan on doing this exact mod this coming week when I get Bob's kit in the mail. Man, I hate waiting for stuff.

[marting]

I'm hoping to get the new crossovers built this afternoon if I can get our 3 year old down for a nap.

[DizRotus]

The K-77 Alnicos sound marginally better than the original K-77Ms, but not better than the Crites. I followed the same one at a time, mono and left right comparison and then both in stereo before I swapped in both K-77s. Now Ive re-installed the Crites.

The K-77Ms and K-77 Alnicos are both for sale. $130/pair with free shipping to the continental U.S. to Forum members. If you're interested, shoot me an email or PM.

Edited January 8, 2015 by DizRotus

[DizRotus]

K-77 backs

[DizRotus]

K-77M fronts

[DizRotus]

K-77M backs

[marting]

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.

[Daddy Dee]

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.

Marting,

Thanks for your take on this. Cleaner midrange is one impression I have had of the same mod on the stock type A on Klipschorns. I have got the type E similarly modded, and have planned to build up a pair of Heresy from the empty cabs. I've had the parts but not the time to get that accomplished.

Hope you will post more as you have time for more listening.

[marting]

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.

[DizRotus]

Chops said: "Since I have been running Bob's CT125's now, the thing I noticed most about them is that they sound exactly like my alinco K77's up to 12-13kHz. The only time I really notice the CT125's is when the program material has information up to 20kHz. Obviously, this information was never heard with the old K77's."

My impressions could be consistent with those of Chops. I say "could be" for the reason that my high frequency hearing is pretty much shot from the mobile DJ days with 4 Speakerlab SKhorns powered by a Dynaco ST-400 in the mid 70s.