Fender Blues deville impedance on external speaker

[woj74]

Hello

I got a used 410 blues deville from mid '90 US made type PR247.
The manual http://www.fender.com/support/manuals/pdfs/manuals_elec/guitarpdf/Blues_De_Ville.pdf says you can plug a 8ohm speaker to external speaker jack but always with cojuction with mian speaker jack plugged in.
Another blues deville reissue manual http://www.fender.com/support/manuals/pdfs/manuals_elec/guitarpdf/Blues_DeVille_Reissue_Rev_B.pdf says you can just plug external speaker at 4 Ohm and plug a dummy jack to main speaker.
Question is: Can i do the same thing with my PR247 US made blues deville?

 

[-CB-]

What they are saying is its an 8 ohm head, that tolerates a 4 ohm load.

You can run 8 internal
You can run 8 internal plus 8 external (4 ohms)
or
You can run as low as 4 external - but if you run any external only speaker, you MUST use a plain ol quarter inch plug in the internal jack....

... because all good tube amp designs SHORT OUT the transformer ON PURPOSE to prevent driving an infinite load, which would kill the transformer and tubes.

Fender, from the very beginning, has used enough iron to make a half impedance mismatch ok.  Going double - to 16 ohms, would be a no no.

 

[woj74]

Thanks CB. I read cefully both manuals. What confuses me is the reissue manual says and shows in the diagram the option: 4 Ohm to external, plain plug to main.
It's not that described i the original PR247 manual.

 

[OzziePete]

Hello

I got a used 410 blues deville from mid '90 US made type PR247.
The manual http://www.fender.com/support/manuals/pdfs/manuals_elec/guitarpdf/Blues_De_Ville.pdf says you can plug a 8ohm speaker to external speaker jack but always with cojuction with mian speaker jack plugged in.
Another blues deville reissue manual http://www.fender.com/support/manuals/pdfs/manuals_elec/guitarpdf/Blues_DeVille_Reissue_Rev_B.pdf says you can just plug external speaker at 4 Ohm and plug a dummy jack to main speaker.
Question is: Can i do the same thing with my PR247 US made blues deville?

Hey Woj!

I had one of those in the early 90s, bought it brand new. Had to sell it though when money got tight at one stage.. :sad:

I saw Buddy Guy one time when I still had that amp, and got curious about getting close to the sound that Guy had with his Bassman amps, on the Deville.

I got reasonably close..... by turning off all the modern enhancements in the circuit to the amp (like reverb, mid gain etc.), getting the amp nice and warmed up, then cranking it to full bore. I got a bit of that mid range choke that happens on genuine Bassman amps, but be careful, it's bloody loud.