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Post by dirtywolf on Mar 23, 2019 19:16:23 GMT -5
Hello Everyone, I have just joined the forum, but I have been playing through a Splawn QR for 5+ years now. I had it custom made at Scott’s shop and he gave me a tour of the place when I picked it up. I live in Charlotte so Dallas NC is not far. I absolutely love the Quick Rod and have enclosed a couple photos of it taken at Splawn factory.   |
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Post by gtrjunior on Mar 24, 2019 5:57:49 GMT -5
Welcome!
It’s a bit slow around here these days but there are still a handful of great guys here to chat Splawn with!!
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Post by dirtywolf on Mar 24, 2019 8:43:37 GMT -5
I have a question if anyone could help, what ohm setting on back of 100 watt QR using 4x12 Splawn small block speaker cab? 4,8, or 16 setting?
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Post by briman on Mar 24, 2019 10:10:21 GMT -5
It depends on what ohm rated the speakers are and then how they are wired. They will be wired in series or parallel. The easiest and best way is to take a multimeter and test the ohm reading using a cable plugged into cab.
Don't use the amp until you determine the ohm setting because it will damage tranny.
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Post by dirtywolf on Mar 24, 2019 13:10:46 GMT -5
Thank you for the answer I will check with meter
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Post by splawndude on Mar 25, 2019 9:49:39 GMT -5
Welcome to the Splawn boards dirtywolf! Your amp looks amazing.  Cool that you got to meet Scott and get a tour. If your cab has Small Blocks like the one listed on Scott's site: splawnguitars.com/cabs.htmThen they are 16 ohms. That would be pretty standard anyway. The Splawn transformers can handle a mismatch in one direction but like briman - no use taking a chance. You can read the cable with a multimeter but it will be slightly off by a few points. A 16 ohm cab might read something like 13 or 14 ohms. Regardless - set you amp to 16 and rock out.[/bold]
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New Member
Mar 25, 2019 11:36:36 GMT -5
via mobile
Post by briman on Mar 25, 2019 11:36:36 GMT -5
If your two 16ohm speakers are wired in series then yes 16ohm setting is good but if they are wired parallel then the load is 8ohm. Use multi meter! My buddy blew tranny with long term mismatch.
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Post by splawndude on Mar 25, 2019 14:01:44 GMT -5
Here's the thing though Brian, unless I'm missing something, - he has a 4x12.
4x12s are traditionally wired in Series/Parallel.
What that means is that 2 speakers (usually the left 2 and then right 2) are first wired in Series. 16+16=32.
Then, those two 'sides' are then wired to each other in Parallel. 32/2 = 16
That way, the end result of the total ohms of the cabinet is back to 16.
Hence the term Series/Parallel. It uses both wiring techniques.
If all the speakers were 8 ohm and it was wired in Series/Parallel then the resulting total ohms of the cab would be 8. I don't think Scott has an 8 ohm Small Block. My 212 cab is 2 -16 ohm speakers wired in parallel for an 8 ohm total cab.
For a 4x12:
If they were all wired in Series it would be 16+16+16+16 = 64 ohm cab. If the whole thing was wired in Parallel I think you would end up with something like 4.
What Marshall did back in the day was they took this Series/Parallel configuration and added a switch basically that allowed you to run the cab in 'stereo' by breaking that last parallel connection and letting you run one amp into half the cab at 8 ohms and then second amp into the other half of the cab at 8 ohms.
But yes, checking the 'tip and ring' sleeves of the cable with the speaker cable plugged into the cab will give you the desired result usually.
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New Member
Mar 25, 2019 14:03:30 GMT -5
via mobile
Post by briman on Mar 25, 2019 14:03:30 GMT -5
Oh sorry ....my bad I thought he had a Splawn 2x12.
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Post by dirtywolf on Mar 25, 2019 18:37:52 GMT -5
Thank you both for this much appreciated input! I checked cab with a meter and it is definitely 16ohms. I am glad I joined this Splawn forum!
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Post by dirtywolf on Jun 6, 2019 7:11:29 GMT -5
My QR has been getting very hot at the top left area of amp any ideas what could be causing this? I havent noticed it before and have been playing through it for 7 years now
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Post by splawndude on Jun 6, 2019 10:46:11 GMT -5
Power tubes are getting hot.
On the far left (facing the amp) is the power transformer so we don't want that to be the culprit.
With your amp you can see the power tubes while you play right? You want to make sure none of those power tubes are getting overly bright or red. If they do, then shut off the amp and get the tubes replaced. Are the power tubes 7 years old and do you play (out) quite a bit?
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Post by dirtywolf on Jun 7, 2019 18:28:22 GMT -5
Yes they are about 7 years old, and play out fairly frequently. Might be time to change tubes? Thank you for replying
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Post by gtrjunior on Jun 7, 2019 18:57:10 GMT -5
Yes they are about 7 years old, and play out fairly frequently. Might be time to change tubes? Thank you for replying Yeah, absolutely I gig semi regularly and I change mine about once a year. If I didn’t gig I’d change them when I started to notice the signs. |
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