czech-one-2
Joined: Aug 06, 2009
Posts: 94
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Posted on Sep 29 2015 07:14 AM
Hi folks, a few months ago I finally picked up an EU230v reissue. Everything works but it just doesn't sound as deep as it should. My belton brick reverb blows it away so I know thats not right. It sounds nice, but lacks depth and has a bit of distortion as the mixer goes above 6-7. [that might be normal]
The first thing I did was replace ALL the electrolytic caps. No improvement. I've tried several accutronics tanks and while some are better than others it still doesnt sound right.Replaced the RCA cables and have swapped tubes with old stock glass.
I've googled gut shot images and my transformer wires seem to go to different terminals than other similar images I've seen. Maybe somebody monkeyed with it at one point. Anyway, I'll post an image of my wiring and another similar unit. The other one has more empty terminals than mine? Maybe thats the 110v v 230v wiring? Anyway, I'm at a loss as to whats wrong with mine.As I said all controls work but its just kind of un-inspiring.
Another thing I noticed is when the unit is in line with my amp, the amp output is padded down noticably, when plugged straight in the amp is louder. [This also might be normal,but I thought I'd mention it.]
Last edited: Sep 29, 2015 07:16:50
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JakeDobner
Joined: Feb 26, 2006
Posts: 12159
Seattle
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Posted on Sep 29 2015 07:17 AM
Have you tried new tubes?
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czech-one-2
Joined: Aug 06, 2009
Posts: 94
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Posted on Sep 29 2015 07:22 AM
Another shot of mine
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czech-one-2
Joined: Aug 06, 2009
Posts: 94
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Posted on Sep 29 2015 07:29 AM
Yes, I've got a stash of tubes and tube swaps havn't helped.
Its wierd cause everything works...so maybe I just got a lemon.
I've:
1]tried tube swaps
2]changed electros
3]changed rca wires
4] did the trebel cap silver mica mod
5]tried 3 different tanks
6] refreshed tube socket solder joints, inspected all wires for loose connections
Last edited: Sep 29, 2015 07:35:29
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Gilette
Joined: May 04, 2014
Posts: 734
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Posted on Sep 29 2015 07:52 AM
I've experienced this once with a Tweed Deluxe. Turned out to be a cold solder joint. Some part just got isolated from ground. It still worked but no excitement or whatsoever in the sound. Hope you get it fixed soon.
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irv78
Joined: Jun 26, 2009
Posts: 99
Austria
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Posted on Sep 29 2015 08:45 AM
Hi Czech-One, I had a very similar problem with my RI unit. It turned out to be a blown diode at the power tube. I made a thread about this issue on OSG:
http://offsetguitars.com/forums/viewtopic.php?f=10&t=52236
If you're comfortable inside a tube-amp you can check the voltage at the cathode of the power tube. See thread above for details.
Hope this helps!
cheers, irv
— 
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dboomer
Joined: Jan 05, 2009
Posts: 262
Port Hueneme, CA
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Posted on Sep 29 2015 10:21 AM
Everything works, but you don't like the tone? What dos that mean? How far is it off? Did it ever sound different (acceptable)?
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czech-one-2
Joined: Aug 06, 2009
Posts: 94
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Posted on Sep 29 2015 10:38 AM
great post Irv78!
Here are my 6k6 readings,these were measured with the tubes in.
pin 3 - 298v [schematic 285v]
pin 4 - 303v [s 295v]
pin 8 - 17.5v [schem 24v]
I cant measure the preamp tubes cause there are no pin numbers on them?
Last edited: Sep 29, 2015 11:38:24
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czech-one-2
Joined: Aug 06, 2009
Posts: 94
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Posted on Sep 29 2015 10:40 AM
dboomer, its hard to explain, but my reverb pedals [belton brick rub-a-dub/Boss RV-6] sound WAY deeper/wetter
So something is amiss I think..
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czech-one-2
Joined: Aug 06, 2009
Posts: 94
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Posted on Sep 29 2015 10:45 AM
Irv78, my diode CR7 seems to be functioning with a reading of .9v on the + leg and infinite on the negative leg.
Last edited: Sep 29, 2015 11:30:58
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czech-one-2
Joined: Aug 06, 2009
Posts: 94
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Posted on Sep 29 2015 10:54 AM
Test point readings
A 305v [schematic 294v]
B 303v [sch 289v]
C 254v [sch 244v]
Last edited: Sep 29, 2015 11:14:00
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irv78
Joined: Jun 26, 2009
Posts: 99
Austria
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Posted on Sep 29 2015 01:17 PM
Hmmm ... the voltages don't seem to be that far off. The voltage on the cathode of the power tube is a tad low. You could try and measure the DC resistance of the cathode resistor (R10) it should read 1KOhm.
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czech-one-2
Joined: Aug 06, 2009
Posts: 94
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Posted on Sep 29 2015 01:42 PM
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irv78
Joined: Jun 26, 2009
Posts: 99
Austria
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Posted on Sep 29 2015 01:57 PM
Then everything seems to be in order around the power tube. Are you using a 6K6 tube? I experienced a sound improvement over the stock 6V6. You wrote that you've changed the C10 capacitor to silver mica, did you also increase the value of the capacitor? Basically your whole reverb signal has to go through this capacitor - this capacitor is really a fun place to experiment with. If you increase it beyond 1000pf you can get a totally sick drip ... but I'd say the sensible maximum value is around 500pf.
Do you have access to another reverb unit to compare the sound? Maybe you could describe your signal chain / guitar / pedals / amp and what settings you use on the reverb unit.
—
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czech-one-2
Joined: Aug 06, 2009
Posts: 94
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Posted on Sep 29 2015 03:38 PM
I believe I used 390pf. Also, I'm using a 6k6.
Last edited: Sep 29, 2015 15:42:59
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dboomer
Joined: Jan 05, 2009
Posts: 262
Port Hueneme, CA
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Posted on Sep 29 2015 09:25 PM
I'm trying to determine if there is an electrical problem or you simply have a unit that doesn't meet your expectations. Have you ever tried and been happy with the same model but a different unit?
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Rossmosis
Joined: Jul 13, 2010
Posts: 180
Austin
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Posted on Sep 29 2015 09:31 PM
Maybe too obvious but you have the pan unlocked right? Last guy I bought a reverb unit from had it locked the whole time...
— The Del-Vipers
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czech-one-2
Joined: Aug 06, 2009
Posts: 94
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Posted on Sep 30 2015 01:06 AM
dboomer wrote:
I'm trying to determine if there is an electrical problem or you simply have a unit that doesn't meet your expectations. Have you ever tried and been happy with the same model but a different unit?
You know, it is possible. I did own a reissue in the 90's and remember it being drippy-er.The belton brick verb has been on my board a few years and its great.
The volume drop when the tank is in line bugs me,as does the hint of un pleasant distortion. Maybe I'll just move it on,build a surfy bear and get a Fender musicmaster bass amp [something I missed since selling mine awile back]
oh, the tank was un-locked... 
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czech-one-2
Joined: Aug 06, 2009
Posts: 94
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Posted on Sep 30 2015 02:03 AM
irv78 wrote:
Hmmm ... the voltages don't seem to be that far off. The voltage on the cathode of the power tube is a tad low. You could try and measure the DC resistance of the cathode resistor (R10) it should read 1KOhm.
Just curious at this point, what would bring the voltage up to spec on the cathode,a smaller resistor value?
Last edited: Sep 30, 2015 02:04:30
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czech-one-2
Joined: Aug 06, 2009
Posts: 94
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Posted on Sep 30 2015 02:13 AM
irv78 wrote:
Do you have access to another reverb unit to compare the sound? Maybe you could describe your signal chain / guitar / pedals / amp and what settings you use on the reverb unit.
I wish I could just A/B it with another reissue!
I'm not playing surf but like to get that drippy,surf/spy+ tremolo thing going on occasion.
Chain-
Partscaster strat w/ EMG S pickups
MXR Dyna Comp-MXR envelope filter-crybaby-Boss PH-2-EA Tremolo- Tech 21 Tri-AC-Ibanez 60's fuzz- Boss LM-2 [as a boost] analog Sound City delay-Boss DD-20-Belton brick verb-Fender 63 tank
home amp- Fender champion 600
Gig amp - JC-120
Last edited: Sep 30, 2015 02:15:40
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