84B Middle
Philco, Philadelphia Stg. Batt. Co.; USA
- Country
- United States of America (USA)
- Manufacturer / Brand
- Philco, Philadelphia Stg. Batt. Co.; USA
- Year
- 1935
- Category
- Broadcast Receiver - or past WW2 Tuner
- Radiomuseum.org ID
- 139539
Front restauriert,L-Stoff original.
Jesus Martin Vizcaino
Click on the schematic thumbnail to request the schematic as a free document.
- Number of Tubes
- 4
- Main principle
- Superheterodyne (common); ZF/IF 460 kHz
- Wave bands
- Broadcast only (MW).
- Power type and voltage
- Alternating Current supply (AC) / 115 Volt
- Loudspeaker
- Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
- Material
- Wooden case
- from Radiomuseum.org
- Model: 84B [Middle] - Philco, Philadelphia Stg. Batt
- Shape
- Table-Cathedral-Type (upright, round top or gothic arch, not rounded edges only).
- Dimensions (WHD)
- 305 x 360 x 200 mm / 12 x 14.2 x 7.9 inch
- Notes
- Model 84B was the third of a series (models 80B, 81B, and 84B) of low cost 4-tube cathedrals that used a regenerative combined IF/detector stage to maximize sensitivity with very few components.
The early version (1934) had a round speaker opening with three vertical bars. The middle version (1935) had a lyre-shaped opening with three vertical bars. The late version (1936) had a continuous arch-shape extending upward from the base, and an oval speaker opening with five mostly vertical bars.
Model 84B continued onward for one more year as model 37-84B, with two more cabinet styles, and a new tube lineup (but still using a similar circuit).
- Price in first year of sale
- 20.00 $
- Source of data
- Philco Radio 1928-1942
- Circuit diagram reference
- Rider's Perpetual, Volume 4 = ca. 1934 and before
- Literature/Schematics (1)
- Philco 1928-36 Wiring Diagrams, Parts Lists, and Essential Service Data
- Literature/Schematics (2)
- Cathedral & Tombstone Radios (page 194.)
- Author
- Model page created by Thomas Albrecht. See "Data change" for further contributors.
- Other Models
-
Here you find 4041 models, 2217 with images and 3690 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Philco, Philadelphia Stg. Batt. Co.; USA
Collections
The model 84B is part of the collections of the following members.
Forum contributions about this model: Philco, Philadelphia: 84B
Threads: 1 | Posts: 8
Salve ai soci , sono alle prese con un problema di Ronzio su questo ricevitore . nonostante abbia gia sostituito gli elettrolitici il ronzio resta. Ho notato che mettendo a massa la griglia della finale ( 42 ) il ronzio smette , quindi presumo che il difetto sia da reputarsi nella zona finale audio. Un'altra cosa che mi sembra anomala e'la tensione troppo bassa sull'anodica e sulla griglia schermo della 77 nella sezione MF ovvero 50sull'anodica e 35 sullo schermo , nn so anche questo possa portare il ronzio ho sostituito i vari componenti in quella zona ma nulla e' cambiato , se qualcuno puo indicarmi come provare a risolvere il problema le sarei grato . Distinti saluti
GABRIELE,
Gabriele Seccia, 08.Dec.11