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Crack;Bottlehead OTL - Page 382

post #5716 of 7306

Hi everyone,

 

I've encountered the first problem with my Crack today after 2 months working perfectly today. After I stopped listening this morning, I noticed the wood base of my Crack had a crack in the 'edge' ( there's a small 'gap' in the corner of the wood base. So I took out the tubes, the plates and use some super-glue to fix the base. After that, I replaced the plate and the tubes, I turned on the Crack again. Then I plugged my T1 into the Crack and...no sound in the left channel, there was only sound coming from the right one. I turned it off, then turned on again, I immediately plugged my T1 back in and the sound was coming from both channels, but as soon as the tubes got a bit warm up, there was a 'buzzing' and no sound from left channel again. I tried another driver tube ( 12AU7 ) only because I don't have any other power tube but my Bendix 6080WB, as well as turning on and off several times but none of them worked.

 

Next, I turned my Crack off and let the tubes cool down. I removed all the tubes, the power cord and the interconnect cable, then I placed the plate side-down to the base and tried gently touching, moving the capacitors, the joints and almost all other things in the circuit which I literally didn't know what I was doing, I was kind of doing some nonsense things there. Finally I placed all things back to its places and gave it one final try before taking the Crack to the Audio repair service.

 

And surprisingly, the problem has been gone since then!

 

I really had no idea what was wrong with my Crack, this is the first time I've had this problem with my newly-built Crack. Everything was firmed and secured as it should be.

 

Does anyone have any idea about this? It would be greatly appreciated! I was a bit worried.

 

Thanks!

Kratos.

post #5717 of 7306

I once couldn't get rid of this annoying humm that was there regardless of what tube I had. I could sometimes get rid of it by giving the top plate a tap... or the transformer a tap... or jiggling a tube. It would just come back a few minutes later. I finally realized it was a loose connection joint at the power tube base where it connects to a bunch of wires. One of the connections had been pulled "out of position" because I had transported it with a large mundorf capacitor loose inside pulling on this wire. After I pinned it back in place with my fingers, it hasn't hummed since.

 

I transport my Crack very carefully and gently now.  

post #5718 of 7306
Quote:
Originally Posted by Aeolus Kratos View Post
 

Hi everyone,

 

I've encountered the first problem with my Crack today after 2 months working perfectly today. After I stopped listening this morning, I noticed the wood base of my Crack had a crack in the 'edge' ( there's a small 'gap' in the corner of the wood base. So I took out the tubes, the plates and use some super-glue to fix the base. After that, I replaced the plate and the tubes, I turned on the Crack again. Then I plugged my T1 into the Crack and...no sound in the left channel, there was only sound coming from the right one. I turned it off, then turned on again, I immediately plugged my T1 back in and the sound was coming from both channels, but as soon as the tubes got a bit warm up, there was a 'buzzing' and no sound from left channel again. I tried another driver tube ( 12AU7 ) only because I don't have any other power tube but my Bendix 6080WB, as well as turning on and off several times but none of them worked.

 

Next, I turned my Crack off and let the tubes cool down. I removed all the tubes, the power cord and the interconnect cable, then I placed the plate side-down to the base and tried gently touching, moving the capacitors, the joints and almost all other things in the circuit which I literally didn't know what I was doing, I was kind of doing some nonsense things there. Finally I placed all things back to its places and gave it one final try before taking the Crack to the Audio repair service.

 

And surprisingly, the problem has been gone since then!

 

I really had no idea what was wrong with my Crack, this is the first time I've had this problem with my newly-built Crack. Everything was firmed and secured as it should be.

 

Does anyone have any idea about this? It would be greatly appreciated! I was a bit worried.

 

Thanks!

Kratos.

 

Quote:
Originally Posted by atsq17 View Post
 

I once couldn't get rid of this annoying humm that was there regardless of what tube I had. I could sometimes get rid of it by giving the top plate a tap... or the transformer a tap... or jiggling a tube. It would just come back a few minutes later. I finally realized it was a loose connection joint at the power tube base where it connects to a bunch of wires. One of the connections had been pulled "out of position" because I had transported it with a large mundorf capacitor loose inside pulling on this wire. After I pinned it back in place with my fingers, it hasn't hummed since.

 

I transport my Crack very carefully and gently now.  

 

Sounds like a similar issue for you, Kratos. I think the issue might be a cracked / partial solder joint or maybe a loose tube socket like what happened on atsq17's Crack. Hopefully it won't come back again, but if it does your local repairer should be able to fix it fairly easily by just reheating all the solder joints (sounds like a worse / bigger job than it really is) and possibly adding a bit of solder if any of the joints look at all questionable.

 

PS - looking forward to hearing your thoughts about the T1 mod when we have some time to chat later today!!

 

 

post #5719 of 7306

I'm looking to purchase a couple new tubes for my crack.  I've stuck with the stock tubes for the last five months and am curious to try something new.

 

I've been wanting to try the Tesla tube out and I've found two different Tesla tubes and I'm wondering if there's any difference between them other than the color of the labeling?

 

http://www.ebay.com/itm/171241597870?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

 

http://www.ebay.com/itm/201108509598?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

 

Both appear similar to me but I thought I'd ask here before I purchase. 

post #5720 of 7306

I finally ordered 2 Mundorf 100uf 400V Film Caps and 1 ALPS Blue velvet Potentiometer just waiting for the reply from the supplier.:biggrin:

post #5721 of 7306
Quote:
Originally Posted by i luvmusic 2 View Post
 

I finally ordered 2 Mundorf 100uf 400V Film Caps and 1 ALPS Blue velvet Potentiometer just waiting for the reply from the supplier.:biggrin:

 

NICE!!  I did the same upgrade and I found that these upgrades made a significant (positive) difference with my Crack.  Enjoy it!!

post #5722 of 7306

ALPS Blue velvet  vs Dale 23 Step, I'm thinking about upgrading my crack, what improvement will I get from each? 

post #5723 of 7306

 I installed this in my Crack and i'am not liking it that much it reduced the BASS and details.The stock POT is not working properly after i uninstalled it that is why i'am getting the ALPS but if that stock pot only works  like before i will reinstall it permanently. 

Processed By eBay with ImageMagick, z1.1.0. ||B2

Processed By eBay with ImageMagick, z1.1.0. ||B2

post #5724 of 7306

I really like the ALPS blue velvet in my amp.  It mitigated the channel imbalance issues I had with the the stock pot.  I cannot say it sounds better, I think it does, but I can say it does not sound worse than the stock pot.  The soldering was a bit tricky, the model ALPS I purchased is just pins, not the rings like the stock, so it takes calm hands and patience to get the connections in place.

 

edit:spelling


Edited by RonO - 8/11/14 at 1:07pm
post #5725 of 7306
Quote:
Originally Posted by i luvmusic 2 View Post
 

 I installed this in my Crack and i'am not liking it that much it reduced the BASS and details.The stock POT is not working properly after i uninstalled it that is why i'am getting the ALPS but if that stock pot only works  like before i will reinstall it permanently. 


That pot looks nothing like the attenuators I have seen installed, these are the ones that seem more common

 

 

post #5726 of 7306

The benefit that i've got from that Attenuator is balance the Left and Right channel and according to the vendor that Attenuator is Stereo but it could be Mono. 

post #5727 of 7306
Quote:
Originally Posted by RonO View Post
 

I really like the ALPS blue velvet in my amp.  It mitigated the channel imbalance issues I had with the the stock pot.  I cannot say it sounds better, I think it does, but I can say it does not sound worse than the stock pot.  The soldering was a bit tricky, the model ALPS I purchased is just pins, not the rings like the stock, so it takes calm hands and patience to get the connections in place.

 

edit:spelling

I'am waiting for mine that and Film caps.:biggrin:

post #5728 of 7306

Just got a reply from Parts connexion the POT and CAPS are shipped today.:dt880smile:

post #5729 of 7306
Quote:
Originally Posted by i luvmusic 2 View Post
 

The benefit that i've got from that Attenuator is balance the Left and Right channel and according to the vendor that Attenuator is Stereo but it could be Mono. 

 

You should get noticeably better clarity compared to the stock pot in addition to the better low volume channel balance.

 

If yours is installed, I luvmusic 2, you can easily test if it's stereo or mono by disconnecting one of the RCAs while you have music playing. If it's a mono pot you'll still hear sound from both sides in your headphones.

post #5730 of 7306
Quote:
Originally Posted by Loquah View Post
 
Quote:
Originally Posted by i luvmusic 2 View Post
 

The benefit that i've got from that Attenuator is balance the Left and Right channel and according to the vendor that Attenuator is Stereo but it could be Mono. 

 

You should get noticeably better clarity compared to the stock pot in addition to the better low volume channel balance.

 

If yours is installed, I luvmusic 2, you can easily test if it's stereo or mono by disconnecting one of the RCAs while you have music playing. If it's a mono pot you'll still hear sound from both sides in your headphones.

Ok i disconnected one of RCA input and the sound on that side disappeared plug it back and do the same to the other channel and again the sound from that channel disappeared so meaning it's a STEREO?THANK YOU!

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