broken reverb tank in a PEARL amp

[Chickenwings]

Re: broken reverb tank in a PEARL amp

its only a small tank. its looks really wimpy and cheapo construction too compared to my small accutronics tank i have lying around.
Thanks for digging around crusty. ive had no luck locating a schematic either.
The guy who asked me to look at it said the reverb made a crashing sound when you bump the amp, but i could not even get it to do that. I think it might be suffering from not just a broken spring , but the fine wires are broken too.
I could perhaps wire in my spare accutronics tank just to see if it works. I dont want him to have it tho, cos its original eqipment of my old princeton. If it does work, i guess i can order one the same.

 

[crusty philtrum]

Re: broken reverb tank in a PEARL amp

I could perhaps wire in my spare accutronics tank just to see if it works. I dont want him to have it tho, cos its original eqipment of my old princeton. If it does work, i guess i can order one the same.

Is the reverb in your old Princeton valve-driven ? If so, it might just work, but not very well. OTOH, if it's a s/s reverb circuit, the spring should work reasonably if not perfectly. Does the amp have space to fit the longer size tank ? (about 17-19 inches long i think)

 

[ItsaBass]

Re: broken reverb tank in a PEARL amp

If there is some way to get an amp repair person to tell you what reverb tank ratings are needed for that amp (input and output impedances), it is very easy to put together the Accutronics part number that you need. That is what Crusty and I were getting at with our earlier posts. It's not that Accutronics originally made the reverb tank, but if you know what ratings you need, you can easily determine which Accutronics models will work as replacements.

 

[Chickenwings]

Re: broken reverb tank in a PEARL amp

Crusty....the princeton is valve driven reverb so ill scratch that as an idea.
Itsa: i cant get a read of the input and output impedances off this tank. i think it has more problems than just the broken spring.

 

[GoldenVulture]

Re: broken reverb tank in a PEARL amp

Crusty....the princeton is valve driven reverb so ill scratch that as an idea.
Itsa: i cant get a read of the input and output impedances off this tank. i think it has more problems than just the broken spring.

I think crusty meant it may not work too well, but it will work enough for you to ascertain whether it's just the tank and/or more of the reverb section that are faulty.

Is the reverb in your old Princeton valve-driven ? If so, it might just work, but not very well. OTOH,

The effect would be reduced volume most likely and maybe a bit of distortion. It's not going to hurt it to plug it in and see if you get reverb. It also may help you ascertain what sort of reverb tank and its impedance you'll need.

If you want to be sure, of not damaging the tank, put your multimeter on a low DC volt scale and connect to the input and out put leads from the amp[ one at a time ] and see if there's any DC leaking into it. You could do the same for AC

 

[LuciferSam]

Re: broken reverb tank in a PEARL amp

Hej guys, I've read through everything that you wrote after not being able to find any information on the reverb tanks of the old Pearl SunFlowers. I just bought one, but can not measure the impedances of the tank, for it is missing.
Did you at last find an Accutronics equivalent, that worked?
Or was it possible to measure the impedances?
And what size is the whole tank, that was built in?
Is there any way to find out, what impedances I need, just by measuring the preamp and the output amplifier?
All that I have are 3 wires hanging down into the plastic bag (2 of them taped together...so it must be the input wires for there are 2 input jacks) and heaps of questions.
Thanks!

 

[LuciferSam]

Re: broken reverb tank in a PEARL amp

I just found the schematics for the Pearl Sunflower!!
Unfortunately there's no data for the reverb tank written (as far as I am able to read).
If anybody feels in the position to make anything out of this, let the forum know!

 

[LuciferSam]

Re: broken reverb tank in a PEARL amp

Unfortunately there's no data for the reverb tank written (as far as I am able to read).

somebody just sent me his measured data of his built-in tank (supposedly little too low due to parallel connected electronics..I don't know which electronics he meant, but I hope it won't make that much of a difference):

input impedance: 40 Ohms
output impedance: 830 Ohms