D Gut Pics

[Structo]

Does anyone know about that first grid resistor? I have seen one or two other pictures of amps in the early 200 range with that same type of resistor.

I think it is a 221K RN65C

The photographer didn't really get that many gut shots.
And of course with the Permatex you can't see much anyway.

So is this amp 203 or 201 or 209?

That last digit is hard to make out.

As I was zooming in I found this little guy.
I'd like to be a fly on the wall when HAD was brain storming.

[talbany]

Not exactly positive about those particular RN65 grid resistors but I think they are low inductance.. Good places to use these would be Grid resistors power tube grids as well and the cathode resistor in the PI... FWIW Carbon comps have very low inductance.. wire wounds the highest..Anyone care to add..

Tony

[Structo]

Yes I have read that as well.

I have those cheap sandbox screen resistors on my screens.
They are wirewound I believe.
What effect would having inductance in those resistors have in the tone?

I have thought about replacing those but I don't know what with.

The RN65C apprantly are metal film but I don't think they are made anymore.

How about those flame proof metal oxide ones?

[ampdork]

4k7 grid stoppers.

Ooh...PEM nuts.

Is that "Tech-Cap" sporting a gold color sharpie mark or is it factory?

Diggin' the mad beats too.... "Polo Collar Pop"

[M Fowler]

Man is tough to read that number but on the other shot from an angle it looked like a 1 but this picture it looks he started with a number and stamped on top of it. Perhaps a mistake in numbering.

[UltraHookedOnPhonix]

Well you said look closely, so I thought there was something there out of the ordinary.

I am HAD so I actually built that amp

Come on now, don't get worked up. Ive seen pics of a few ODS amps and I just thought there was something special (read out of the ordinary) with this amp.

Only thing I did notice was weirdness on the output tubes. Odd "cathode" resistors, only two tubes have them. Also what are with the 2R resistors that look like caps?

Yes, there was something out of the ordinary: high-res gut pics of an later gen ODS. This is a very valuable tool for would-be builders. I don't know of a more effective way (besides getting your hands on one) to be able to study and learn the Overdrive Special.

[UltraHookedOnPhonix]

Does anyone know about that first grid resistor? I have seen one or two other pictures of amps in the early 200 range with that same type of resistor.

I think it is a 221K RN65C

The photographer didn't really get that many gut shots.
And of course with the Permatex you can't see much anyway.

So is this amp 203 or 201 or 209?

That last digit is hard to make out.

As I was zooming in I found this little guy.
I'd like to be a fly on the wall when HAD was brain storming.

OMG!!! Overfly Special!

[bluesfendermanblues]

Well you said look closely, so I thought there was something there out of the ordinary.

I am HAD so I actually built that amp

Come on now, don't get worked up. Ive seen pics of a few ODS amps and I just thought there was something special (read out of the ordinary) with this amp.

Only thing I did notice was weirdness on the output tubes. Odd "cathode" resistors, only two tubes have them. Also what are with the 2R resistors that look like caps?

Yes, there was something out of the ordinary: high-res gut pics of an later gen ODS. This is a very valuable tool for would-be builders. I don't know of a more effective way (besides getting your hands on one) to be able to study and learn the Overdrive Special.

UltraHookedOnPhonix, really nice of you to share those pics.

I have a whole pile of those on my computer and I use them for reference when building an amp. You never know when they will come in handy. Thanks.

[Structo]

Yes I was pleasantly surprised when I zoomed in at how high the resolution is.

Too bad he only took a few gut shots.

No snubbers on V2.

Something I was wondering about, this chassis appears to be black anodized aluminum where on the earlier ones they were either powder coated or painted black.

Does anyone know for sure if HAD switched to the anodized chassis later?

[UltraHookedOnPhonix]

Well you said look closely, so I thought there was something there out of the ordinary.

I am HAD so I actually built that amp

Come on now, don't get worked up. Ive seen pics of a few ODS amps and I just thought there was something special (read out of the ordinary) with this amp.

Only thing I did notice was weirdness on the output tubes. Odd "cathode" resistors, only two tubes have them. Also what are with the 2R resistors that look like caps?

Yes, there was something out of the ordinary: high-res gut pics of an later gen ODS. This is a very valuable tool for would-be builders. I don't know of a more effective way (besides getting your hands on one) to be able to study and learn the Overdrive Special.

UltraHookedOnPhonix, really nice of you to share those pics.

I have a whole pile of those on my computer and I use them for reference when building an amp. You never know when they will come in handy. Thanks.

No prob, bluesfenderman. You're right, they're good for the pic stash

Yes I was pleasantly surprised when I zoomed in at how high the resolution is.

Too bad he only took a few gut shots.

No snubbers on V2.

Something I was wondering about, this chassis appears to be black anodized aluminum where on the earlier ones they were either powder coated or painted black.

Does anyone know for sure if HAD switched to the anodized chassis later?

I think HAD switched to the black anodized ones after he used those 3-part chassis with wodden sides like amp #155 and #183. I would estimate the all-black anodized chassis started showing up in amps with serial numbers in the 190's, early 200's.

[martin manning]

Man is tough to read that number but on the other shot from an angle it looked like a 1 but this picture it looks he started with a number and stamped on top of it. Perhaps a mistake in numbering.

I'm guessing the image was altered to smear the last digit. Looks like it was a "4" to me.

MPM

[ToneMerc]

Does anyone know about that first grid resistor? I have seen one or two other pictures of amps in the early 200 range with that same type of resistor.

Yep, it's a CGW (Corning Glass Works) precision metal(tin) oxide RN65C 22.1K .25%

[Structo]

You're right, I had my decimal point one off.

[Structo]

Man is tough to read that number but on the other shot from an angle it looked like a 1 but this picture it looks he started with a number and stamped on top of it. Perhaps a mistake in numbering.

I'm guessing the image was altered to smear the last digit. Looks like it was a "4" to me.

MPM

I don't think it was intentionally smeared digitally.
I think he probably had the 020 done when the chassis was built but then would hand stamp the last digit, and it didn't come out too well.
Just a guess.

[David Root]

The second 0 is different than the first 0. So he had some chassis made up with 02.. and then hand stamped 04. Looks like a 4 to me.

I agree with Dr. Spock (sorry Ultra I can't help myself) that this is a valuable resource, especially for me as I have not yet got to the HRM and may want to combine the HRM with Music Man iron....that in itself could be a big thread, there doesn't seem to be a whole lot on Music Man w/HRM in the files. Is that a good idea or not?