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FDP Forum / Fender Amps: Vintage (before 1985) / Got a big head today - AKA NAD

swampyankee
Contributing Member
**********
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olde New England

If you can't play good, play loud
Apr 21st, 2017 03:24 PM   Edit   Profile   Print Topic   Search Topic

Been looking for a vintage Fender head to go with my 2-12 Bandmaster cabinet, searching for that classic clean Fender tone, reverb, and tremelo. I bid on a couple Bandmaster Reverbs and lost, and finally decided to pull the trigger on a '70 Dual Showman Reverb. I was afraid of running out of clean headroom and wanted nice and punchy. No better way than a Showman

Go big or go home

(This message was last edited by swampyankee at 05:28 PM, Apr 21st, 2017)

Hammond101
Contributing Member
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So. Cal. USA

Apr 21st, 2017 03:53 PM   Edit   Profile   Print Topic   Search Topic

Congrats on solving your dilemma. A Twin Reverb Chassis in a head cabinet and renamed Dual showman Reverb. 1970 was a good year for these. They really don't weigh much more than the BMR but are the king of loud and clean.

I'm sure you already know but if this amp has not had filter and bias cap service recently, with in the last 10 years or so, it needs it. Sure don't want to damage the new baby.



swampyankee
Contributing Member
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olde New England

If you can't play good, play loud
Apr 21st, 2017 07:38 PM   Edit   Profile   Print Topic   Search Topic

Comes to me allegesly with a full recap and new power tubes. I'll pull the chassis to make sure and verify the workmanship

pcalu

usa metro detroit

Apr 22nd, 2017 06:50 AM   Edit   Profile   Print Topic   Search Topic

Great Find!

Take in mind those amps don't have to be loud and clean. You can bias them hot and black face them. I have a 75 Twin Reverb (with the above).. and although I'm not going to get major tube saturation... at working gig levels I get a very nice warm semi break up, just on the verge ...which is exactly where most of us want to be. Just touch it with a tube screamer and it pushes it over the top. That Twin is one of my all time favorite amps to play

swampyankee
Contributing Member
**********
*

olde New England

If you can't play good, play loud
Apr 23rd, 2017 06:28 AM   Edit   Profile   Print Topic   Search Topic

I'm running 16 ohm Warehouse G12C, G12C/S speakers in my cabinet, which total 8 ohms load. I've read that although the ohms mismatch is within Fenders tolerance, it reduces power output (Fender fact or myth?). I'm fine with that, since Fenders optimistic 100 watt rating (more like 85 watts) is a bit overkill. 65ish watts is pretty much the range I'm looking for.
Even so, I gave the amp-speaker rig a good test the other night and I like the way it sounds together. I chose the G12/C, CS combination based on Warehouses recommendation that they would give me a nice vintage Jensen tone. I'm not a vintage speaker expert, but it all sounds good to my ear.

(This message was last edited by swampyankee at 09:17 AM, Apr 23rd, 2017)

Hammond101
Contributing Member
**********

So. Cal. USA

Apr 24th, 2017 09:50 AM   Edit   Profile   Print Topic   Search Topic

When in good shape that amp will run loads from 2 ohms to 8 ohms safely. Going higher to 8 ohms is actually a bit more potentially harmful than dropping to 2 ohms if you really push the amp. It has to do with a wave the bounces back to the OT when running them above 4 ohms. OT temps increase.

The way you plan to run this one there should never be an issue. You will lose a bit of output and punch but you most likely will not notice it.

Yeah that 100 watt rating is pretty much an exaggeration. High 70s to low 80s is about all you can get out of this circuit.

One thing that players do with the Twin is to remove either the inner or outer pair of 6L6 power tubes then rebias. The amp will then be looking for the 8 ohm load that you have. (most would disconnect one 8 ohm speaker to match the load and get a further reduction in volume) There is a reduction in volume but not as much as you may think. The amp will hair up a bit earlier on the dial. You might try this and see how it works for you if the thing is a bit much as is.

swampyankee
Contributing Member
**********
*

olde New England

If you can't play good, play loud
Apr 24th, 2017 05:17 PM   Edit   Profile   Print Topic   Search Topic

I was reading about removing 2 power tubes as well as removing V1 preamp tube, which would disable the normal channel and drive the vibrato channel more. Not sure if I want to do any of that yet. I was really looking for a Bandmaster Reverb with more headroom and I'm pretty happy with what I'm hearing so far.
I was looking things over today and saw that, although filter caps have been replaced, the ciruit appears to be otherwise original. Tubes are a mixed bag, and I've already had to replace a couple.

(This message was last edited by swampyankee at 07:22 PM, Apr 24th, 2017)

FDP Forum / Fender Amps: Vintage (before 1985) / Got a big head today - AKA NAD




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