Bass amp build

[dansamp]

I just built a B15 preamp using Kevin O'Conners version using a 12AX7 and am running it into my Dynaco MKII mono block
dan...
[IMG:150:128]http://img381.imageshack.us/img381/3762/img0512lw8.th.jpg[/img]


[IMG:150:128]http://img381.imageshack.us/img381/5930/img0510bz5.th.jpg[/img]

sorry for the crappy photo's
if anyone is interested I can take some better ones









I also have a set of V4 transformers kicking around that I hope to eventually use for a bass amp build

Dan...................



[IMG:150:128]http://img115.imageshack.us/img115/6151/img0511ph9.th.jpg[/img]



http://img406.imageshack.us/img406/8706/img0509mf0.jpg

[jbrew73]

I'm in the process of building a 4 x KT88 Hiwatt DR201 inspired bass amp myself.

i'd like to hear details about this build

[Structo]

Can you upload the pictures directly to the forum using the attachment thing down below?
I can't ever maximise those fileshack images because my anti spy software goes bonkers with there ads.

[dansamp]

how's that I edited my previous post

does that work for you
Structo ??

[doctord02]

I'm in the process of building a 4 x KT88 Hiwatt DR201 inspired bass amp myself.

i'd like to hear details about this build

Just using the KT88 schematics from Mark Huss' website and adapting what parts I have - a toroid dual secondary 325-0-325-0 PT stacked like the DR201. Hammond choke. A Fender surplus PS180 OT from Risson. Weber SLO chassis and head box with a custom faceplate. A bit of a hack, to be honest... Mix of freehand point to point and turretboard. A flatpack Triode transformer to get my bias voltage... Any thing specific you wanna know, just ask.

I only work on it in fits and starts and have been laid up recovering from surgery for the last week.

[jbrew73]

i am curious if you are doing any mods to the circuit. which preamp did you use?

[doctord02]

i am curious if you are doing any mods to the circuit. which preamp did you use?

Using the '70's four input per Mark's suggestion, but only the normal channel hi and lo inputs to avoid using an extra tube. No mods per se, just deviations to accomodate parts on hand or easily available (ie, the toroid PT, and 220uF PS filter caps - one for every 2 100uF on the schematic basically).

I'll have a slightly more robust bias circuit, but other than that, I'm not intentionally altering the design. If it aint broke...

[dr. who]

You could try and make it a dumbleland 300...

[selloutrr]

is a schematic or layout available for the dumbleland 300?

[selloutrr]

I was surfing around on the web and found that the dumbleland 300sl was built around an SVT output and the Ampeg V9 preamp (late 70's guitar amp) with the addition of reverb. sounds like it would be a really cool tone.

[Alexo]

That sounds like an awesome amp concept. You've gotta post pics.

A huge B15 is pretty much what almost any bass player needs.

Well... you twisted my arm.