301-A: Difference between revisions
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{{GR Product | |||
|model=301-A | |||
|codes= | |||
|class=parts and accessories | |||
|summary=Rheostat | |||
|image=GR 301 Close-Up.jpg | |||
|caption=General Radio 301-A Series Rheostats | |||
|series= | |||
|introduced=1932 | |||
|discontinued=1954 | |||
|designers= | |||
|manuals= | |||
* '''Manual Needed.''' | |||
{{Catalog History}} | |||
}} | |||
The {{Title|General Radio 301-A Series Rheostats}} was introduced in {{Catalog G1}} and remained available through {{Catalog N}}. | |||
The Type 301-A series are general purpose rheostats with 3 to 4 watt dissipation depending on the model. As seen below different types of wire is used dependant on resistance required. All are equipped with a ¼ inch stainless steel shaft and [[KNSP-6]] knob. All the members of the series share the same type number, they differ by the code word. | |||
==Specifications== | ==Specifications== | ||
* '''Maximum Dissipation:''' 4 w without protection strip and 3 w with protection strip | |||
* '''Winding Length:''' 3¾ inches | |||
* '''Useful Angle of Rotation: 255° | |||
* '''Shaft:''' ¼ inch stainless steel | |||
* '''Wire Code''' | |||
* '''A:''' Copper Nickel (Constantan) | |||
* '''L:''' Copper Nickel | |||
* '''N:''' Nickel-Chromium-Iron | |||
* '''R:''' Chromium-Aluminum-Iron | |||
{| class="wikitable" style="margin:auto" | |||
|+ Type 301-A Series of Rheostats | |||
|- | |||
! Type!! Maximum<br>Resistance !! Maximum<br>Current !!Approx.<br>Turns !! Wire !!Code<BR>Word | |||
|- | |||
| 301-A || 5 Ω || 900 ma || 140 ||L || PALSY | |||
|- | |||
| 301-A || 10 Ω || 630 ma || 180 ||L || REMIT | |||
|- | |||
| 301-A || 20 Ω || 450 ma || 225 ||L || RENEW | |||
|- | |||
| 301-A || 50 Ω || 280 ma || 190 ||A || RIFLE | |||
|- | |||
| 301-A || 100 Ω || 200 ma || 235 ||A || RIGID | |||
|- | |||
| 301-A || 200 Ω || 140 ma || 300 ||A || REBUS | |||
|- | |||
| 301-A || 500 Ω || 90 ma || 375 ||A || RIVAL | |||
|- | |||
| 301-A || 1000 Ω || 65 ma || 475 ||A || RAVEL | |||
|- | |||
| # 301-A || 2000 Ω || 39 ma || 580 ||A || READY | |||
|- | |||
| # 301-A || 5000 Ω || 24 ma || 630 ||N || ROMAN | |||
|- | |||
| # 301-A || 10 kΩ || 17 ma || 780 ||N || CURRY | |||
|- | |||
| # 301-A || 20 kΩ || 12 ma || 840 ||R || CRUMB | |||
|- | |||
|} | |||
* '''#''' Supplied with linen-phenolic protecting Strip | |||
==Links== | ==Links== | ||
==Photos== | |||
<gallery> | <gallery> | ||
GR 301 Front.jpg | |||
GR 301 Front A.jpg | |||
GR 301 Rear.jpg | |||
GR 301 Top.jpg | |||
</gallery> | </gallery> | ||
[[Category:Parts and Accessories]] | [[Category:Parts and Accessories]] | ||
Revision as of 23:37, 10 July 2024
The General Radio 301-A Series Rheostats was introduced in Catalog G1 (1932) and remained available through Catalog N (1954).
The Type 301-A series are general purpose rheostats with 3 to 4 watt dissipation depending on the model. As seen below different types of wire is used dependant on resistance required. All are equipped with a ¼ inch stainless steel shaft and KNSP-6 knob. All the members of the series share the same type number, they differ by the code word.
Specifications
- Maximum Dissipation: 4 w without protection strip and 3 w with protection strip
- Winding Length: 3¾ inches
- Useful Angle of Rotation: 255°
- Shaft: ¼ inch stainless steel
- Wire Code
- A: Copper Nickel (Constantan)
- L: Copper Nickel
- N: Nickel-Chromium-Iron
- R: Chromium-Aluminum-Iron
| Type | Maximum Resistance |
Maximum Current |
Approx. Turns |
Wire | Code Word |
|---|---|---|---|---|---|
| 301-A | 5 Ω | 900 ma | 140 | L | PALSY |
| 301-A | 10 Ω | 630 ma | 180 | L | REMIT |
| 301-A | 20 Ω | 450 ma | 225 | L | RENEW |
| 301-A | 50 Ω | 280 ma | 190 | A | RIFLE |
| 301-A | 100 Ω | 200 ma | 235 | A | RIGID |
| 301-A | 200 Ω | 140 ma | 300 | A | REBUS |
| 301-A | 500 Ω | 90 ma | 375 | A | RIVAL |
| 301-A | 1000 Ω | 65 ma | 475 | A | RAVEL |
| # 301-A | 2000 Ω | 39 ma | 580 | A | READY |
| # 301-A | 5000 Ω | 24 ma | 630 | N | ROMAN |
| # 301-A | 10 kΩ | 17 ma | 780 | N | CURRY |
| # 301-A | 20 kΩ | 12 ma | 840 | R | CRUMB |
- # Supplied with linen-phenolic protecting Strip
