Parts/ suppliers links for 90's HRM builds

[Guitarman18]

I'm working on a spreadsheet that will enable new (also old) members to look up a particular part and have a link directly to that part at a known supplier. On my previous builds I have found the BOMs that are posted very useful, but often I have found that I am faced with some speculation over the correct choice of part. Also, I suspect that the no. 1 asked question on this forum is 'where do I get trimmers' or something like that.
If you are a parts supplier on the forum and would like to be linked in, then please let me know who you are.
If you are already working on something similar, please let me know so that I can have the next week off!
If you are a senior member and you have the wisdom, (you know who you are..... ) please drop by this thread now and again to help fill in the inevitable blanks in this mammoth task.

Let me begin by asking if anyone knows which specific brand/type are the blue MF's (Metal Films that is FYI....) used widely in HAD's 90's HRM's.

Are these correct? (1/2 watt)

http://www.mouser.com/catalog/specsheets/XC-600046.pdf

There are so many of the MF's in there, so I don't want to begin by creating links to the wrong parts and then have to start over.

Many thanks in advance for any help anyone can offer with this quest, and as always, I really appreciate the time and effort that many of you put into making this forum such great place to hang out.

Cheers,

Paul.

[glasman]

Xicons will work, but they sound nasty.

KOA speers are a better choice to my ears.

Gary

[Guitarman18]

The path to tonal nirvana never seems to run smoothly...... Originally I stocked up on carbon films as listed in some of the BOM's in the files section and then I began to see more use of MF's from the experienced members, so I stocked up on those, but alas, it seems as though a little knowledge can be a dangerous thing (as always ).
Are the KOA's the one's HAD predominantly used in LC's amp?

[glasman]

The path to tonal nirvana never seems to run smoothly...... Originally I stocked up on carbon films as listed in some of the BOM's in the files section and then I began to see more use of MF's from the experienced members, so I stocked up on those, but alas, it seems as though a little knowledge can be a dangerous thing (as always ).
Are the KOA's the one's HAD predominantly used in LC's amp?

I haven't a clue what HAD used, but I will guarantee they were what ever were cheap and sounded good to his ears, I like the sound of the KOA metal films. But I also like a mix of metal film and carbon film. Of course this is only my opinion.

The older Dumbles also used Sprague (vitamin q series ????) resistors that are no longer available.

The KOA MF do not exhibit the edginess that the Xicon MF have when used on the plates. The KOA would also be a good replacement for the Vishay Dale resistors as I am pretty sure that you can't get them in the UK as they are not RoHs compliant.

Gary

[Guitarman18]

glasman wrote:

The KOA would also be a good replacement for the Vishay Dale resistors as I am pretty sure that you can't get them in the UK

Thanks once again Gary, but I can't even see the KOA's over here. I might have to reinvent the wheel by trying out all the domestic brands and see what works. Luckily I have a stock of RN65's from mouser so at least I can build a 'baseline' unit to discover the mojo for myself.

Also, looking thru resophonics HRM pictures, does anyone know the brand/type of these screen resistors?

[ic-racer]

I got these from Mouser, 286-470-RC. The value is different, but they look similar.

[Guitarman18]

ic-racer wrote:

I got these from Mouser, 286-470-RC. The value is different, but they look similar.

ic-racer, they are the same as I used on my non-HRM build. It's difficult to know whether they are the same unit but repackaged or entirely different. I think my best chance of success in this endeavour is to list a)suitable substitutes, b)currently available equivilants and c) exact match components.
It was interesting to hear Gary's comments, that not all MF's are created equally, but also some should be avoided!

Looking at the picture below, the MF's 'look' the same as those in LC's amp. It would be interesting to know if the builder remembers the supplier or any part numbers.


resophonic's HRM pics and Funk's memorex build, seem to show Xicon MPP caps. Are these essential ingredients for a grail tone HRM or 6PS OD's still in the running.

Cheers,

Paul.

[ic-racer]

I think my best chance of success in this endeavour is to list a)suitable substitutes, b)currently available equivilants and c) exact match components.

I agree that would be the best way to do it.

"a)" could be filled in with data from some currently available BOMs and I suspect it may take a long time to fully fill in the "c)" column but in my opinion that would be the most valuable info!

[Guitarman18]

Guitarman18 wrote:

Looking at the picture below, the MF's 'look' the same as those in LC's amp. It would be interesting to know if the builder remembers the supplier or any part numbers.

Just been trawling thru the archives and found this:

ayan wrote:

What I think is that the resistors look like the KOA Speer (or whatever) that Dumble used in the early 90s amps

I must have read every post on this sight, but my brain must have decided I didn't need to remember that at the time!!

[Guitarman18]

Does anyone know who sells NTE MF resistors?

Thanks in advance.

Cheers,

Paul.

['67_Plexi]

Does anyone know who sells NTE MF resistors?

Thanks in advance.

Cheers,

Paul.

In the US many of the small hobby electronics stores are NTE resellers.
A lot of the time NTE packaged parts are just something else rebranded.
The MF resistors they sell look like the blue ones seen in some of the pics.

I wouldn't get too hung up about it. When HAD was tweaking Eric Johnsons amp a few years ago, he used parts from Rad Shack.

[Funkalicousgroove]

I've seen plenty of xicon MF resistors in recent Dumbles, as well as the NTE stuff- Dude just uses what's at hand-Really.

[Guitarman18]

Here is my provisional list of parts so far. There are some question marks on some items which need filling in by those that know.

The objective of this exercise is to have one thread that linked people to the various parts in a HRM build. In order to get the ball rolling I've filled in as much as I can. You will notice that some websites don't let you link directly to the product, I don't know a way round that issue.

If anyone has strong feelings/objections to a particular part, please let me know.

If the format does not work for you or the hyperlinks don't work, can you please also let me know.

If there is anything I have missed or the description of a part is wrong just pm me.

Cheers,

Paul.

[ic-racer]

Wow, good work!

[Guitarman18]

ic-racer wrote:

Wow, good work!

Thanks ic-racer, it took some time and I'll be the first to admit I could probably spend a great deal more time on it, but I thought it was time to get it out there and start some debate maybe.