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Blackface Fender Bassman Heads


crunchee

Question

Posted

I've got a '67 Blackface Fender Bassman head (Model AB165) that I'm tempted to have mods done to it, to increase it's usuable potential as a Fender amp. Forums online often have owners who want to turn them into Marshalls or Dumbles, but I'm quite happy keeping it in the Fender realm of things, and sticking a distortion pedal in front of it when needed.

The tone report on mine, unmodded, is as follows:

The normal channel is what you'd call 'Fender clean', though it sounds slightly edgier than other Fenders (namely, a '67 Twin Reverb and a '73 Vibrolux Reverb). I like this! No changes really necessary.

The bass channel needs some modification, it's kinda weird as you'd expect it to have lots of bass and be boomy. It ISN'T. Bass is good, but it seems to have LOTS of mids/high mids, it can get really bright on the bridge pickup (I used a FM Special) making turning down the tone almost mandatory, and very 'acoustic' sounding on the neck pickup.

My question: has anybody else run into this on a Blackface Bassman head? Did you make any changes (besides sell it? :D )?

This amp has got LOTS of potential IMHO, the output transformer is HUGE, and there is TONS of clean headroom, and I consider the lack of reverb/vibrato to be a plus as there is nothing to get in the way of the signal except the amp itself...but the frequency range definitely needs tweaking on the bass channel. I'm thinking about having mods done along the line of this, as it doesn't seem to radically alter the amp. Anybody try this, or know of anybody who did? Pointers appreciated!

http://acruhl.freeshell.org/mga/main/AA864_vs_AB165.html

10 answers to this question

Recommended Posts

Posted

Try playing a bass guitar through the bass channel into a real bass cabinet, that seems to be a pretty good combo for that channel.

I have, a bass sounds good as is through the amp and a matching Fender 'small' 2x12" cab. Looking for ways to make the bass channel more guitar friendly.

Edited to add: I haven't linked the channels yet, got nothing to lose there so will give it a try. Not sure if it'll tame the mids on the bass channel by mixing the two channels, but who knows?

Posted

Jay's math looks right to me. You'd be surprised what a nice germanium treble booster could bring out in that bass channel, specially with some Brit-voiced speakers.

Posted

I played through one a few years back with my Strat. Loved the tone, I don't remember what cab it was plugged into, but it sounded like a slightly warmer/spongier Pro Reverb.

Posted
Bassman

+

Marshall 4x12

+

treble booster

='s

OMG

+1 on the 4x12 cabinet... I like a 15" too. Impedance mismatching always equal fat tone when it comes to blackfaces IMHO, but EMMV.

Posted

The bass player in one of my former bands has one. One day I hooked it up to a 2X12 guitar cabinet, plugged in a Telecaster, and cranked it up to ten. I was amazed at how incredible it sounded. The amp didn't sound that great at lower volumes. It was too clean.

Posted

Jay's math looks right to me. You'd be surprised what a nice germanium treble booster could bring out in that bass channel, specially with some Brit-voiced speakers.

I'll have to give that a shot, though I'd think that using a treble booster in a channel that is already bright is a bit counter-intuitive.

The bass player in one of my former bands has one. One day I hooked it up to a 2X12 guitar cabinet, plugged in a Telecaster, and cranked it up to ten. I was amazed at how incredible it sounded. The amp didn't sound that great at lower volumes. It was too clean.

Actually, I LIKE clean! :lol: You're right about cranking it, it will roar; I used to drive a neighbor crazy when I played the Bassman head cranked through a 2x12" in the garage I had at the time...and she lived about 100 yards away! :lol: I think she just hated guitar driven music, or other people having fun while doing things that she didn't do. :D

Do you remember which channel you used? Normal or Bass channel?

Posted

With Brit-voiced speakers, you'll get a nice mid to upper mid "honk" from the combination of the Ge treble booster and the Fender circuit. There's nothing overtly spikey with this combination, just great cut and a thick midrange. Many treble boosts today have a wider-ranging "fatboost" mode, which boosts the lower frequencies as well. (Mine does, but I rarely use it). Alternately, you may decide to bump up the bottom end to your taste via the amps tone controls or with EQ, however. Try one sometime (maybe borrow from a friend or a shop) - you might be as pleasantly surprised with the results as I was...

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