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Crack;Bottlehead OTL - Page 423

post #6331 of 6338
Quote:
Originally Posted by JamieMcC View Post

Very neat build. have you had the kit for some time or is it new? I noticed you have the original black output capacitors  some kits have been shipping with blue ones.

I have had the kit for six months but only started building it yesterday.


It sounds amazingly good with sennheiser hd530
post #6332 of 6338

I'm joining the club, Crack + Speedball on its way :D

 

Now I need to see what tools I need to buy, cause I'm bare naked regarding that.

post #6333 of 6338
Quote:
Originally Posted by Klots View Post



I thought it was quiet too, but yesterday after 1 hour of listening the noise came in. It is lower frequency than with 5998, but it is still there, and it goes quiet when tapped like with the 5998. Previously both tubes were perfectly silent. Less than a month ago that noise appeared for the first time. But if both tubes react the same, then the tube(s) should not be the cause. That squeal does not get louder with volume. I change out electrolytic caps today and see if anything changes. 

Radio interference. Dimmer, cell phone, router, wifi nearby?
post #6334 of 6338
Tube squeal is an oscillation. It is often caused by contaminants making a connection in the signal path less than perfect. So cleaning tube pins and sockets is always a good place to start. It might be worth running the amp in a configuration that allows you to move parts under the chassis while it is misbehaving to see if one particular part or connection is the cuplrit. Using a non conductive probe like a chopstick is a good way to gently push on parts to see if it helps.
post #6335 of 6338
post #6336 of 6338
post #6337 of 6338
Quote:
Originally Posted by listen4joy View Post
 

How is this solder iron for the crack?

 

http://www.ebay.com/itm/291148382103?_trksid=p2059210.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

 

80W is more than ample, it might be to hot! Something with variable temperature can be found at a similar price

 

http://www.ebay.co.uk/itm/50-Watt-Soldering-Station-Iron-/351258230886?pt=UK_Home_Garden_PowerTools_SM&hash=item51c89f4066

 

I have been using one of these solder stations and have been pleased with it (Maplins also sells different sized spare tips). 

 

http://www.ebay.co.uk/itm/60W-ESD-PROTECTION-LCD-SOLDERING-IRON-STATION-NEW-/201098498782?pt=UK_Home_Garden_PowerTools_SM&hash=item2ed26792de

post #6338 of 6338
Quote:
Originally Posted by Doc B. View Post

Tube squeal is an oscillation. It is often caused by contaminants making a connection in the signal path less than perfect. So cleaning tube pins and sockets is always a good place to start. It might be worth running the amp in a configuration that allows you to move parts under the chassis while it is misbehaving to see if one particular part or connection is the cuplrit. Using a non conductive probe like a chopstick is a good way to gently push on parts to see if it helps.



One small thing I discovered. When the tube is making squeal, then when I unplug the headphones and then plug them in again it goes quiet. Have tested it 5 times, and it works everytime.

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