diytube.com

And now for your listening enjoyment: The Hammertone BFA!!







Don

looks really sweet! now, let's see the bass that goes along with this beauty

This was built to use as the house amp at The Times Changed High and Lonesome Club. So it gets everything from upright to Muckbucket to whatever electric the bassist brings along.

http://www.highandlonesomeclub.ca/

Don

Let's see... B. F. A......, Hmmmm...... Bass Frequency Amplifier

BTW, what speakers do you feed with this amp?

/ed B in NH

Don,

Very nice work!

Regards,

Very nice job Don ! Can I ask you what tool you use to install the "rivnut" (threaded inserts) on the chassis bottom ? I hate sheet metal screws and want to get a tool. I see them on eBay, just looking for an experienced opinion.

Out here in the west we call them "nutserts" and I use a pair of vicegrips to install them. Not the best and I had to ruin a few to get the hang of it. Basically, squeeze them very gently a little at a time and make sure the hole is the right size. These are 8-32 but I keep meaning to go to 10-32, 8-32 is a little thin for these big amps.

The Hammertone Viper ended up doing a header into the ditch this summer during a road trip to Alberta. One broken resistor lead and four bent chassis screws was all the damage (also some "patina")

Don

Old Joke: Back east they call it premature ejaculation but out here in the west we call it havin' a fast gun.

There is a nice tool on eBay for $ 99, and the guy sells all sizes of the Nutsert / Rivnuts ... it would beat vice grips ... I don't know if I'd use it enough, but I hate the bottoms of chassis held on with sheet metal screws.

http://cgi.ebay.com/ebaymotors/RIVNUT-RIVET-NUTSERT-TOOL-COMPLETE-KIT-w-NUTSERTS_W0QQcmdZViewItemQQcategoryZ63702QQitemZ4514291311QQrdZ1QQsspagenameZWD1V

Very nice!

And I would bet it will go up to 11 !

I bought the Nutsert/Rivnut tool and it came today ... I put 4 of the 6/32's in the bottom of my 6EM7 PP amp for the bottom plate ... very cool and professional looking. I hate sheet metal screws. That's how I judge quality of broadcast equipment I work with - if they hold it together with sheet metal screws or not. Yellow_Light_Colorz_PDT_16

BTW, what speakers do you feed with this amp?

Sorry Ed, I just noticed your question. The amp is fed into an Ampeg 8x10.

Don

Beautiful work on this amp. Is that a 6SN7 peeking out from those power tubes? If so, is this an Eico-style driver setup?

That chassis looks to be about 18" x 8" x 2", no? I really wish Hammond offered an off-the-shelf chassis in something close to this size.

Jim

This just what I'm looking for. What kind of circuit? Is there a layout for the illiterate or schematically challenged? Iron. A BFA is on the list. Great looking work. You got sound clips going? Thanks, Len

Is that a 6SN7 peeking out from those power tubes

I stole the phase invertor unabashedly from http://www.aikenamps.com/

under:
Designing Long-Tail Pairs - The Load Line Approach

it used a 6SL7.

I'll try to post the schematics.

Don