183(ish) build

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GAStan
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183(ish) build

Post by GAStan »

My second Dumble type build. Huge THANK YOU to everyone that has made the layout and schematic freely available here on TAG.

AN Silver chassis
Edcor Iron
3x Noval
4x EL34
Alpha pots
3 footswitchable relays-PAB, FET and OD.
20 AWG solid conductor PVC jacketed wire

Following 183 values shown on current layout by Tony Albany.
https://ampgarage.com/forum/viewtopic.php?f=5&t=13095
Current production NTE MF where indicated and CF from Jelle. Caps as noted on layout, all current production.
20231217_082021.jpg
20231217_100838.jpg
20231217_192356.jpg
20231217_192359.jpg
Not sure why pics are upside down :?
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Glenn

I solder better than I play.
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GAStan
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Credits

Post by GAStan »

Layout and schematic by Tony Albany
https://ampgarage.com/forum/viewtopic.php?f=5&t=13095

Eyelet layouts by Martin Manning
https://ampgarage.com/forum/viewtopic.p ... b5c6f717c1

FET bias procedure by Martin Manning
https://ampgarage.com/forum/viewtopic.php?f=5&t=18389
Glenn

I solder better than I play.
dbharris
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Re: 183(ish) build

Post by dbharris »

Looking good!

Just a heads up those current production NTE in 1/2W are metal oxide, not metal film.

-Dan
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GAStan
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Re: 183(ish) build

Post by GAStan »

dbharris wrote: Tue Dec 19, 2023 7:15 pm Looking good!

Just a heads up those current production NTE in 1/2W are metal oxide, not metal film.

-Dan
I appreciate the heads up but are you sure?

Their website states they are Metal Film.
https://www.ntepartsdirect.com/ENG/CATEGORY/RESISTORS

I really hope their website is correct because I got quite a few...
Glenn

I solder better than I play.
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GAStan
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Re: 183(ish) build

Post by GAStan »

GAStan wrote: Tue Dec 19, 2023 7:23 pm
dbharris wrote: Tue Dec 19, 2023 7:15 pm Looking good!

Just a heads up those current production NTE in 1/2W are metal oxide, not metal film.

-Dan
I appreciate the heads up but are you sure?

Their website states they are Metal Film.
https://www.ntepartsdirect.com/ENG/CATEGORY/RESISTORS

I really hope their website is correct because I got quite a few...
I just sent an email inquiring about this to NTE's customer service, I'll post here any response I receive.
Glenn

I solder better than I play.
dbharris
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Re: 183(ish) build

Post by dbharris »

GAStan wrote: Tue Dec 19, 2023 8:02 pm
GAStan wrote: Tue Dec 19, 2023 7:23 pm
dbharris wrote: Tue Dec 19, 2023 7:15 pm Looking good!

Just a heads up those current production NTE in 1/2W are metal oxide, not metal film.

-Dan
I appreciate the heads up but are you sure?

Their website states they are Metal Film.
https://www.ntepartsdirect.com/ENG/CATEGORY/RESISTORS

I really hope their website is correct because I got quite a few...
I just sent an email inquiring about this to NTE's customer service, I'll post here any response I receive.
I am pretty sure, but please let us know what you find. I spoke with several vendors trying to track down any MF they may still have in stock over the summer. A couple confirmed that NTE phased out MF, the shiny blue type you see in many Dumbles and replaced them with MO the dull greyish type you have.

-Dan
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GAStan
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Re: 183(ish) build

Post by GAStan »

dbharris wrote: Tue Dec 19, 2023 8:45 pm I am pretty sure, but please let us know what you find. I spoke with several vendors trying to track down any MF they may still have in stock over the summer. A couple confirmed that NTE phased out MF, the shiny blue type you see in many Dumbles and replaced them with MO the dull greyish type you have.

-Dan
I also sent an inquiry to nteinc.com tech assist. Their datasheet just says "METAL" on the top, not specifying Film or Oxide. Now I'm not so sure they are MF like I was before. Regardless I'm going to see how they sound. If I don't like them I've got a full set of CF from Jelle I can put in with current production Dale RN and CMF MF for plates and cats.

Yes I'll definitely post any replies I get from NTE, but might be some time with the Holidays....
Glenn

I solder better than I play.
jabguit
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Re: 183(ish) build

Post by jabguit »

"The selections includes: Metal Film Flameproof, Power Wirewound Cermet, and Carbon Composition."
Jack Briggs
Briggs Guitars
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GAStan
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Re: 183(ish) build

Post by GAStan »

jabguit wrote: Wed Dec 20, 2023 12:19 pm "The selections includes: Metal Film Flameproof, Power Wirewound Cermet, and Carbon Composition."
I agree it does state that.

This is one of the resistors I ordered, HW215 1/2 watt 1k5 MF
https://www.ntepartsdirect.com/ENG/PRODUCT/HW215
It states this is Flameproof Metal Film.

Yet the datasheet available at the bottom only states METAL, not specifying if MF, MO or anything else.

On NTE's website searching for the same part number HW215 gets the same datasheet with no other information.
https://www.nteinc.com

Tip: once on the product page click CHECK STOCK to see links to several electronic vendors.
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Glenn

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bepone
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Re: 183(ish) build

Post by bepone »

metal oxide and metal film are all FILM, correct name for metal oxide is metal oxide film..

i think that NTE is MOX blue and gray version the same, only old/new, but to be sure must be destroyed and compare the resistance track inside between those NTE and regular MOX resistor....i never did because i find NTE so rarely in this part of the planet :P
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jelle
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Re: 183(ish) build

Post by jelle »

I got a few today and will do tests. They may be the same, jelle
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jelle
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Re: 183(ish) build

Post by jelle »

Be careful with this here, the resistor will short once the conformal coating gives out. I would move it away from the nut. jelle
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jabguit
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Re: 183(ish) build

Post by jabguit »

jelle wrote: Wed Dec 20, 2023 11:29 pm Be careful with this here, the resistor will short once the conformal coating gives out. I would move it away from the nut. jelle
or replace steel nut with a nylon nut....
Jack Briggs
Briggs Guitars
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GAStan
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Re: 183(ish) build

Post by GAStan »

Thanks Jelle and Jack for the catch and suggestions.

I'll pt a longer screw and nylon spacer like on the other screw holding the FET board. I don't have any nylon nuts or screws.
Glenn

I solder better than I play.
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martin manning
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Re: 183(ish) build

Post by martin manning »

Just move it over a bit...
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