Complete Bluesmaster Layout

[67plexi]

Thank you Ultra, Ohomite # 20J6KOE x 2, 10 watt 6k.

Steve.

[UltraHookedOnPhonix]

Thank you Ultra, Ohomite # 20J6KOE x 2, 10 watt 6k.

Steve.

Yeah, that’s it.

Markus,

All HRM's I've seen pics of (except one) use either one 10W or two paralleled 10W PI dropping resistors.

For anyone interested, use Ohmite 20 series.

I used two //6K, 10W for my build (pictured in this layout).

Thanks a lot for sharing your observations!
Any idea why HAD used 10W or even //10W resistors for HRMs/BMs while he used 2-3W resistors on some non-HRMs?

Peace,

Markus

I can’t comment on why HAD used 10W resistors in the PS, however I’m fairly sure that judging by his frequent use of them in his newer creations, it seems to demonstrates a deliberate want on his part to have them included. Why, I don’t know. Maybe these power resistors have inductive properties that are beneficial?

[Bob Simpson]

I didn't see it mentioned yet, but the ceramic cap on the mid boost switch on the front panel is labeled 391k in the layout, and 390pf on the schematic.

I may be wrong, but I think 391k is cap code for 390pf

Sorry... Showing my ignorance.
The other ceramics, and the schema, are noted in pf's...

Bob

[stevlech]

Sorry... Showing my ignorance.
The other ceramics, and the schema, are noted in pf's...

Oops... I didn't mean to come across like a jerk. There was quite a bit of controversy over the caps in #183 and it was pointed out that some caps are labeled differently, so I was attempting to be cautious in my reply.

I'm sorry- I wasn't calling you out.


Have a great day and Happy Halloween.

[Structo]

Yeah, with ceramics anymore I just meter them because they can vary so much and many times the writing on them is too small for me to read.

[Bob Simpson]

Sorry... Showing my ignorance.
The other ceramics, and the schema, are noted in pf's...

Oops... I didn't mean to come across like a jerk. There was quite a bit of controversy over the caps in #183 and it was pointed out that some caps are labeled differently, so I was attempting to be cautious in my reply.

I'm sorry- I wasn't calling you out.


Have a great day and Happy Halloween.

No offense taken.

I'm a computer programmer by discipline, and inconsistencies catch my
attention.

I went back to the layout, and noticed a 501k snubber on V1b's grid, and a 500pf treble cap on the HRM board...

I didn't know they meant +/- the same value. Learning is good, no?

Bob

[stevlech]

Learning is good, no?

Always

[67plexi]

The treble Potentiometer, fender part # 021857 is a 250k audio. CTS. It has 2-35 stamp on it.

Steve.

[talbany]

The treble Potentiometer, fender part # 021857 is a 250k audio. CTS. It has 2-35 stamp on it.

Steve.

Steve that 2-35 indicates a special taper speced out by Fender a hybrid...Not totally sure the info in my notes are 100% accurate the "2" imples 2%-taper at 10%-rotation I believe..

Tony

[David Root]

Ultraphonix,

That is possible with two inductors in parallel, but it is also possible with a single wirewound inductor. So why use two? Do you get reinforcement? Have not gotten into inductors until recently.

I'm just getting into HAD's use of inductor(s) in the SSS filter system. It appears that iron core inductors which have picked up some permanent magnetizing in the core, from whatever source, distort earlier than cores that are not so magnetized, AND, they produce EVEN ORDER harmonics as well as uneven. Without the magnetization only odd order harmonics occur. HAD used iron core inductors in the SSS, at least the early ones.

This is also the basis of the Vox wah pedal Fasel inductor "myth" and has been known and in the public domain for quite a few years, although I only found out about it recently.

NOW, how on earth does that translate into the power supply? Ya got me!

[UltraHookedOnPhonix]

Ultraphonix,

That is possible with two inductors in parallel, but it is also possible with a single wirewound inductor. So why use two? Do you get reinforcement? Have not gotten into inductors until recently.

I'm just getting into HAD's use of inductor(s) in the SSS filter system. It appears that iron core inductors which have picked up some permanent magnetizing in the core, from whatever source, distort earlier than cores that are not so magnetized, AND, they produce EVEN ORDER harmonics as well as uneven. Without the magnetization only odd order harmonics occur. HAD used iron core inductors in the SSS, at least the early ones.

This is also the basis of the Vox wah pedal Fasel inductor "myth" and has been known and in the public domain for quite a few years, although I only found out about it recently.

NOW, how on earth does that translate into the power supply? Ya got me!

Interesting stuff about the SSS inductors!

I suppose the inductive properties of the resistor(s) would (in a small way?) contribute to the additional suppression of differential mode noise. After all that’s partly what the choke in the amp does.

www.murata.com/emc/knowhow/pdfs/te04ea-1/26to28e.pdf

Maybe it’s a bit of a stretch though, since there’s already a big fat choke upstream. But again, HAD’s incessant use of them in either pairs or singles shows that he wanted them there. I can only assume it was because they resemble Tootsie Rolls…