PhilAndrews

'51 Chieftain - Radio Rebuild

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I've put the radio back on my workbench (first time in over a year) and plan on getting back to the conversion and rebuild.

 

Just had a head-scratching moment but found the power transformers have a fairly significant revision change between the years so I need to re-draw the circuit diagram to account for that.

 

Phil

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20200514_132040.thumb.jpg.71ac86b4efaa3fc2e137be8746361f80.jpg

There we go. With the exception of the 6 prefix on the tubes (going to replace them with the 12 variants) that's what's getting built. 

 

Phil

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Nope. This is.

 

20200515_152219.thumb.jpg.1645e7424f3fb1ff20bc0a22b0bf0efb.jpg

 

Minor revision, helps if you actually look at the chassis to see what's fitted when there's alternative choices.

 

Phil

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On 2/19/2019 at 6:54 PM, PhilAndrews said:

Is there meant to be a lower bellhousing cover?

 

The manual picture looks like there should be.

 

Phil

yes, pontiac used a sheet metal lower inspection cover to protect the flywheel/torus from the weather.

 

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12 hours ago, PhilAndrews said:

20200520_152923.thumb.jpg.b46695f0c335c4e72b267104915a048e.jpg

Getting a collection of parts together, preparation to rebuild.

 

Phil

phil, i have several 53-54 pontiac chieftain parts radios, so if you need a replacement tube for one that's bad, call me 4176935219, charles.

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6 hours ago, pontiac1953 said:

phil, i have several 53-54 pontiac chieftain parts radios, so if you need a replacement tube for one that's bad, call me 4176935219, charles.

 

They'd have to be '56 onward- this is going to be (probably) the only 12V '51 radio out there.

(Unless I'm getting my years wrong, when did Pontiac go 12V?)

 

Phil

Edited by PhilAndrews (see edit history)

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Ok, I thought it was 55 or 56.

 

I've bought the 12V heater variants of the tubes the '51 radio uses. The B+ power supply is now natively 12V.

I didn't want to be running the radio through a voltage dropper circuit. They get a little too hot for my tastes. The radio gets warm enough as it is.

 

Phil

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20200522_110701.thumb.jpg.3e95a290a6badb313933f0e9fab8280a.jpg

14C5 power output tubes arrived.

 

The rest of the bits that I actually need to start are typically first to have been ordered and last to arrive....

 

Phil

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20200524_111114.thumb.jpg.97239a85766e9395985235093776a5a7.jpg

Component parts complete (apart from one bit which isn't a showstopper).

 

 

Plays okay. Not bad reception for around here.

 

Phil

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