SanchoPansen
Joined: Jan 04, 2011
Posts: 1588
Berlin L-Berg
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Posted on May 18 2012 11:37 AM
Thanks everyone. I really think this is the best forum I've ever been to!
Still missed to donate something, but will do asap!
I have a tech guy who will give me the right cables and he will check if the impedance has been changed. Tubeswell wrote on a different post that unexperienced people like me should stay away from testing this 
I think I'll get a pair of the Eminence Texas Heat speaker. Really liked the sound samples on their page. The Jensen are also fine, but quite expensive.
/Edit: the 8ohms Jensen are sold out at the UK Dealer 
— The Hicadoolas
Last edited: May 18, 2012 11:41:05
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SanchoPansen
Joined: Jan 04, 2011
Posts: 1588
Berlin L-Berg
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Posted on Aug 21 2013 03:44 AM
Sooo, a couple of months later and I went a totally different direction. I've put in one JBL D140F. Impedance on this one is 5.7Ohms, so it shouldn't cause any trouble. Check out the looks:
image
image
— The Hicadoolas
Last edited: Aug 21, 2013 03:46:00
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tubeswell
Joined: Sep 24, 2011
Posts: 1424
Wellington, NZ
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Posted on Aug 21 2013 04:08 AM
FWIW the speaker impedance is a nominal rating (- the real impedance of a speaker through an output transformer varies with frequency, signal strength etc) and what you've got will be fine.
As for mucking around with high voltage stuff, depends how adventurous you're feeling.
— He who dies with the most tubes... wins
Surf Daddies
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SanchoPansen
Joined: Jan 04, 2011
Posts: 1588
Berlin L-Berg
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Posted on Aug 21 2013 06:20 AM
Well, we've checked the impedance of this particular speaker and it only has ~5.7 Ohms. So you also confirm that this is really working out as a long term combination?
— The Hicadoolas
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tubeswell
Joined: Sep 24, 2011
Posts: 1424
Wellington, NZ
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Posted on Aug 21 2013 07:11 AM
The stock quad reverb has 4 x 16R in parallel (which is 4R). Going to 5.7R isn't going to do any harm at all.
— He who dies with the most tubes... wins
Surf Daddies
Last edited: Aug 21, 2013 07:12:13
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SanchoPansen
Joined: Jan 04, 2011
Posts: 1588
Berlin L-Berg
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Posted on Aug 21 2013 07:43 AM
Great, thanks for confirming! Btw, it sounds fantastic!
— The Hicadoolas
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AXXA
Joined: Mar 30, 2013
Posts: 51
Atlanta GA
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Posted on Aug 21 2013 10:43 PM
Dude that looks sick! I bet that big old JBL sounds great!
I'm quite happy with my '69 Twin (also 100w) but those Quads look like they mean serious business!
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SanchoPansen
Joined: Jan 04, 2011
Posts: 1588
Berlin L-Berg
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Posted on Aug 22 2013 02:21 AM
It really sounds great. I wish it would be possible to put a tone ring in it. I recently bought an old tone ring cab (Echolette) off the bay, but it needs restoration. The other JBL D140F will go in it as soon as it's finished. The downside of this combination is the weight. It's a pain to carry and I thought about putting some wheels at the bottom, but then again there are always lots of stairs...
Our other guitar player has a BF Twin in a head and runs it through a selfmade 1x15" tone ring cab. They both are really powerful amps. I mean REALLY powerful There might be some difference between the circuits, but tbh, I think they sound quite equal (loud!). Master volume is always on 10 to keep as much headroom as possible.
— The Hicadoolas
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dboomer
Joined: Jan 05, 2009
Posts: 262
Port Hueneme, CA
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Posted on Aug 22 2013 10:39 AM
Well, we've checked the impedance of this particular speaker and it only has ~5.7 Ohms. So you also confirm that this is really working out as a long term combination?
You probably measured with an ohmmeter. 5.7 is the "DC resistance" which is almost always lower than the "impedance" by about 25%. So this speaker would be called 8 ohms impedance
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heepeejeep
Joined: Feb 28, 2013
Posts: 350
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Posted on Aug 22 2013 11:46 AM
Funny, I too actually swapped in an JBL D140F today into my -65 Twin Reverb Custom 15". Not tried it out much yet but it shure sounded "killer" with the Bass VI.
Last edited: Aug 29, 2013 18:06:48
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Hammond101
Joined: Feb 22, 2013
Posts: 342
SoCal USA
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Posted on Aug 22 2013 05:32 PM
As an owner of many JBL D120, 130, & 140 speakers over the years, some F models some not, use caution when powering only one of them with an 85 watt Fender. These speaker will take a licking but some are a bit fragile. I've overheated a few in my day.
For total stage reliability with a 40 watt Fender 1 JBL is cool. With an 85 watt head you really need a pair if you are going to crank the amp.
— Keep it Drippy Brothers and Sisters!
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SanchoPansen
Joined: Jan 04, 2011
Posts: 1588
Berlin L-Berg
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Posted on Aug 22 2013 11:46 PM
@dboomer: thanks for the info, learned something today and will keep it in mind!
@heepeejepp: nice concidence wait 'till you can crank it up a little.
@Hammond101: are you only referring to the F series, or alu dome JBLs in general? I wonder how all the 1x15" Showman speaker could stay alive then? The Quad has 100W IIRC, BUT I never go past 4 on the volume (with the master on 10). Hope the speaker can take this beating in the long run. Maybe it's time to order some Webers. Getting the right baffle for the amp was the hardest part anyway. Thanks for the advice.
— The Hicadoolas
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tubeswell
Joined: Sep 24, 2011
Posts: 1424
Wellington, NZ
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Posted on Aug 23 2013 01:02 AM
dboomer wrote:
Well, we've checked the impedance of this particular speaker and it only has ~5.7 Ohms. So you also confirm that this is really working out as a long term combination?
You probably measured with an ohmmeter. 5.7 is the "DC resistance" which is almost always lower than the "impedance" by about 25%. So this speaker would be called 8 ohms impedance
+1 Especially with JBL speakers
— He who dies with the most tubes... wins
Surf Daddies
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heepeejeep
Joined: Feb 28, 2013
Posts: 350
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Posted on Aug 23 2013 03:11 AM
From the specs, I can't see any reason to worry.
Does'nt the peak power from the 4 ohm amp decrease since the speaker is 8 ohm (and won't my ears starts to bleed before the speaker?  )
Last edited: Aug 23, 2013 03:23:31
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