Blackface Deluxe Reverb extension speaker question

[tedzepplin]

The Blackface Deluxe Reverb has an 8 ohm speaker output.

If I connect a speaker to the extension speaker jack and keep the internal speaker connected, will both jacks output 8 ohms?

[Dave C]

Both jacks are wired in parallel , the BFDR output transformer is 8 ohms. Two 8 ohm speakers in parallel are 4 ohms . Fender OT's can handle up to a 100% mismatch such as this without having any problems . It'll work fine.
Dave C

[John Phillips]

With any other Fender amp I would agree with Dave, but the Deluxe/DR is the exception... due to the odd (factory) choice of OT ratios, the amp is already significantly low-mismatched even when running an 8-ohm load - the true matching load impedance is about 12 or 13 ohms from what I remember.

I would not run 4 ohms from it, especially if you're going to really push the amp - the tubes won't like it at all.

I'd maybe consider running the internal 8-ohm speaker and an external 16-ohm cabinet at the same time (though even that is outside the safe mismatch range, just), but I would avoid using two 8-ohm speakers.

I'm sure many people have done so over the years and not blown anything though...

[Shea]

Originally Posted by John Phillips

With any other Fender amp I would agree with Dave, but the Deluxe/DR is the exception... due to the odd (factory) choice of OT ratios, the amp is already significantly low-mismatched even when running an 8-ohm load - the true matching load impedance is about 12 or 13 ohms from what I remember.

So, I suppose a Deluxe Reverb might sound better if one were to replace the 8-ohm combo speaker with a 16 ohm one.

Shea

[John Phillips]

Originally Posted by Shea

So, I suppose a Deluxe Reverb might sound better if one were to replace the 8-ohm combo speaker with a 16 ohm one.

Yes.

The best-sounding DR I've ever heard was a '69 SF fitted with a 16-ohm 65W McKenzie. At the time I couldn't understand why it was so much better-sounding and LOUDER than any other DR I've ever heard, since I assumed the "mismatch" would reduce the power. Later I found out about the mismatched stock ratio and it all made sense. Also why fitting a DR with 6L6s and still using the stock 8-ohm speaker works so well...

That characteristic flubby/pushed-too-hard-mush sound of a DR is actually very characteristic of a low mismatch, if you know what to listen for... not actually of 6V6s, even though the DR is usually thought of as the 'classic' 6V6 amp.

[tedzepplin]

Originally Posted by John Phillips

With any other Fender amp I would agree with Dave, but the Deluxe/DR is the exception... due to the odd (factory) choice of OT ratios, the amp is already significantly low-mismatched even when running an 8-ohm load - the true matching load impedance is about 12 or 13 ohms from what I remember.

I would not run 4 ohms from it, especially if you're going to really push the amp - the tubes won't like it at all.

I'd maybe consider running the internal 8-ohm speaker and an external 16-ohm cabinet at the same time (though even that is outside the safe mismatch range, just), but I would avoid using two 8-ohm speakers.

I'm sure many people have done so over the years and not blown anything though...

Does this apply to the new Deluxe reverb Reissues too?

[blkjazz]

Originally Posted by tedzepplin

Does this apply to the new Deluxe reverb Reissues too?

Bump.

I'm curious about this too.

[JJman]

Originally Posted by John Phillips

With any other Fender amp I would agree with Dave, but the Deluxe/DR is the exception... due to the odd (factory) choice of OT ratios, the amp is already significantly low-mismatched even when running an 8-ohm load - the true matching load impedance is about 12 or 13 ohms from what I remember...

What is the impedance ratio of the transformer in them?

[tedzepplin]

Originally Posted by JJman

What is the impedance ratio of the transformer in them?

John left the Gear Page building a long time ago.

[Ronsonic]

Originally Posted by JJman

What is the impedance ratio of the transformer in them?

The turns ratio squared.

Sorry. Not really meaning to be a smart ass.

Next time I've got one on the bench I'll look into this.

[bluetweed]

Most of the new transformer companys replacements are true 8 ohms, so no worries there.