100w Bluesmaster- I've made a start

[Charlie Wilson]

Thanks for posting those, CW. Do you know the serial number?

Yes Martin it is #189. I had this amp on my bench a few years ago and I just recently was looking at my photos and realized after staring at the resistor values in the PI that it is a 50W Bluesmaster.
CW

[martin manning]

Thanks! The trimmer on the mid pot ground is something I haven't seen before.

[Structo]

Some more differences, the Mid pot is marked 250K.

Usually a 50K right?

[norburybrook]

Yes, I've got a 50k in mine as per the layout.


Marcus

[norburybrook]

ah, April 27th it seems was my last vist.

so, I've just got back from my tour of Australia and have made a start today.

slow progress but progress



quick question; can I use a 1N4007 instead of a 1N4003 for the feed to the LED?


Marcus

[xtian]

can I use a 1N4007

Yes.

[norburybrook]

couple of hours today.


question about relays; do I wire them the same as my 102 as shown to me by Martin manning ? I have no jazz rock so martin did me a layout.

I know there's talk of the HRM amps linking the PAB and OD as there's a separate tone stack for the OD.


if that's the was to do it what do I do? I have the same 2 relay boards from Mike at Marsh amps.

cheers

Marcus

[martin manning]

PAB is implemented a bit differently in the BM layout, otherwise it's the basically the same tone stack. I'll have a closer look later.

[norburybrook]

thanks Martin.

been mixing in the studio today but still managed a few hours on the amp.

Coming along, although it's been such a while since the last one I've forgotten all the little things I should have remembered and have made some of the same mistakes again painted myself into a corner with a few earth's etc.

couldn't find an elegant way to fit 5 cables into one eyelet on the power board so have had to attach two from the top....not pretty but seems mechanically sound.


Marcus

[martin manning]

Eliminating the R/J switch is pretty straightforward; see marked-up T. Albany layout below. For the relays, I believe your PAB relay board will work with the connections moved appropriately, but the OD relay board would need some modification. Maybe you can find some "universal" boards?

[norburybrook]

thanks martin.

looking at it, if I use the relay board I have and do the modifications shown?


Marcus

[norburybrook]

job done



and the rest of todays work.


Marcus

[norburybrook]

todays efforts....

where is the V1b coupler? I can't work out where to attach the wire from the 3rd leg of the master volume pot. Is there a schematic for the bluemaster?


Marcus

[martin manning]

Hi Marcus, it's the end of the 0.02 that also connects to the OD Relay board, 4th cap from the input end of the preamp board. Schematics are here: https://tubeamparchive.com/viewtopic.ph ... 194#223194

[norburybrook]

well......I've finished wiring it all up............forgot what a lot of work goes into these amps.

now the tricky bit. I'm always very apprehensive about the first power up . It takes so long to get to this stage it would be great if for once everything just worked!

now, I don't have the correct 3amp fuse ( I ordered the wrong size) can I use the 2 amp from my 102 for testing?


and, can someone quickly remind me of the testing procedure, I have my light bulb limiter ready.

if anyone can spot anything blaringly wrong now's the time to let me know.

cheers

marcus