Hi, I am getting a 'crushing ice' type, white noise type of sound particularly on high notes seemingly coming from the Reverb Tank. I've tried a few different valves and nothing seems to make a difference.Most annoying. The clean clarity is missing.
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![]() Joined: Oct 19, 2013 Posts: 32 Hervey Bay ![]() |
Hi, I am getting a 'crushing ice' type, white noise type of sound particularly on high notes seemingly coming from the Reverb Tank. I've tried a few different valves and nothing seems to make a difference.Most annoying. The clean clarity is missing. |
![]() Joined: Nov 16, 2013 Posts: 4537 Wisconsin ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
Can you record this sound? —Wes DISCLAIMER: The above is opinion/suggestion only & should not be used for mission planning/navigation, tweaking of instruments, beverage selection, or wardrobe choices. |
![]() Joined: Feb 25, 2006 Posts: 19346 Des Moines, Iowa, USA ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
The usual advice is to try swapping in new/different tubes/valves, checking input jack connections, checking/swapping RCA cables, and/or connecting your RCA cables to a different pan (perhaps to a pan in another amp). Hopefully you can isolate the problem that way. Good luck. —Site dude - S3 Agent #202 "It starts... when it begins" -- Ralf Kilauea |
![]() Joined: Jul 24, 2012 Posts: 2762 Finknabad, Squinkistan ![]() ![]() ![]() ![]() |
The pan is the weak link but also the cheapest. It's never a bad investment to have a few alternates on hand even for different sounds, as they vary widely. — |
![]() Joined: Sep 24, 2011 Posts: 1424 Wellington, NZ ![]() ![]() ![]() ![]() ![]() ![]() |
Reissue reverb tank - could be a number of things - particularly a cold solder joint (in which case reflow all the solder joints with 60/40 leaded solder) or it could be loose socket pins (retention the pins with a watchmaker/jeweller's screwdriver - with the power off and the filter caps drained) or it could be a bad tube, cable or pan, or a bad filter cap If you don't feel confident about working inside your amp and don't understand tube-amp electronics - take it to a tech. Which tubes did you change? —He who dies with the most tubes... wins Last edited: Apr 09, 2016 19:38:59 |
![]() Joined: Oct 19, 2013 Posts: 32 Hervey Bay ![]() |
Thanks Wes, Brian, JObeast and Tubeswell, Sorry I've taken a while to acknowledge your kind suggestions but work has taken the place of enjoyment this week. I had a 6K6 RCA, a Sovtek 12AT7 and 12AX7 in when it started doing this. I decided to go back to the original specs of an Electro Harmonix 6V6 Groove Tube, 12AT7 and 12AX7, all new, and, if anything, its worse! At least as bad. I've just played for 4 hours of deafening and annoying ice crunching and white noise, hitting wrong notes everywhere because of the distraction! Sorry Wes, sending a recording of it is a bit beyond my Internet capabilities. I will now check out all the advice given, starting with cables and loose connections. The main power cable for the Unit is covered in hard plastic and is very stiff and crinkled from years of folding and unfolding for transit. Could that be a problem? I will put back a 6K6 NOS and take it from there. Thanks again all and I'll post the results, hopefully good. |
![]() Joined: Nov 16, 2013 Posts: 4537 Wisconsin ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
No apology needed Denis, just trying to figure out what "crushing ice" type noise sounds like so we can give you some advice on a possible direction. —Wes DISCLAIMER: The above is opinion/suggestion only & should not be used for mission planning/navigation, tweaking of instruments, beverage selection, or wardrobe choices. |
![]() Joined: Sep 24, 2011 Posts: 1424 Wellington, NZ ![]() ![]() ![]() ![]() ![]() ![]() |
Turn the mix control all the way to dry. Is the crushing ice sound still there? —He who dies with the most tubes... wins |
![]() Joined: Oct 19, 2013 Posts: 32 Hervey Bay ![]() |
I put back some NOS 6K6, 12AX7 and 12AT7, and began experimenting with leads. Huge difference immediately, (probably because of the second valve change) I have 7 leads of all differing lengths and brands and after swapping them around found that two started causing the crushing ice sound to come back again so I relegated them to the bin. One of the others was alright but when everything started heating up it started breaking down. The bin again! I always thought that leads either worked or they didn't. Obviously not. I am going to have to buy new leads. Are Mogami as good as they say or are there any other that are recommended by any of you guys. By the way Tubeswell, the mix control didn't have any effect on the problem. Thanks anyway. |
![]() Joined: Sep 24, 2011 Posts: 1424 Wellington, NZ ![]() ![]() ![]() ![]() ![]() ![]() |
Pull all the tubes out, and switch the power on. Can you see/smell any smoke? —He who dies with the most tubes... wins |
![]() Joined: Oct 19, 2013 Posts: 32 Hervey Bay ![]() |
Let me rephrase Tubeswell, when I turned the mix all the way to dry it did stop the problem but I had no reverb at all.Winding it back to wet again I was back with the reverb and the noise again. I think I'm on top of it with the new valves and the leads. |
![]() Joined: Sep 24, 2011 Posts: 1424 Wellington, NZ ![]() ![]() ![]() ![]() ![]() ![]() |
If its an RI tank, and you've tried replacing all eh tubes and pan cables and the pan, then I suspect one or more cracked and/or cold-solder joint(s). This is a problem with unleaded solder. The cure is to reflow all the solder joints very sparingly with 60/40 leaded rosin core solder. If you're not confident about working on the innards (high voltage and such) take it to a tech. —He who dies with the most tubes... wins Last edited: Apr 18, 2016 13:19:23 |
![]() Joined: Feb 29, 2012 Posts: 310 Germany ![]() ![]() ![]() ![]() |
what´s your dwell setting? what kind of guitar/PUs do you use? here comes the WEST SAMOA SURFER LEAGUE Last edited: Apr 18, 2016 13:36:04 |
![]() Joined: Jul 24, 2012 Posts: 2762 Finknabad, Squinkistan ![]() ![]() ![]() ![]() |
Did you swap tanks yet? They do go bad. I fixed one old one by epoxying small shims between the tiny transformers and the frame they were attached and where the two springs join at mid length. This eliminated distortion generated mechanically by small moving parts over a half century. As I said before, every Pan is different and they do go bad. Bundyguitar wrote: — |
![]() Joined: Oct 19, 2013 Posts: 32 Hervey Bay ![]() |
I'm not confident enough about soldering etc in there Tubeswell. If after trying everything else and there still is a problem I'll take it to a tech.. Denis (Bundy Guitar) |
![]() Joined: Sep 24, 2011 Posts: 1424 Wellington, NZ ![]() ![]() ![]() ![]() ![]() ![]() |
Another possibility is loose tube socket pin clamps/bad contact. The cure for that is to re-tension the pin clamps by gently squeezing them together with a small jewellers screwdriver (with the tubes pulled out). Make sure the amp is off and unplugged and that the filter caps are discharged before you attempt this. —He who dies with the most tubes... wins Last edited: Apr 19, 2016 05:03:27 |
![]() Joined: Oct 19, 2013 Posts: 32 Hervey Bay ![]() |
Yeah, the pins all seem to be straight enough. Will keep in mind the clamps though. |
![]() Joined: Jul 24, 2012 Posts: 2762 Finknabad, Squinkistan ![]() ![]() ![]() ![]() |
Did you buy a couple safe tanks yet? — |
![]() Joined: Oct 19, 2013 Posts: 32 Hervey Bay ![]() |
I bought a MOD Tank 4AB3C1B Tank a while back. I had trouble getting the 4 Support Springs off and back on so left the old one in. Any idea where I can get 4 new support springs to attach the tank? |
![]() Joined: Nov 16, 2013 Posts: 4537 Wisconsin ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
Bundyguitar wrote:
Do you have a hardware store? (a real one) —Wes DISCLAIMER: The above is opinion/suggestion only & should not be used for mission planning/navigation, tweaking of instruments, beverage selection, or wardrobe choices. |