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Old 23rd Apr 2021, 8:46 am   #8
jjl
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Join Date: Jan 2003
Location: Ware, Herts. UK.
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Default Re: Where is the RF amplifier?

Quote:
Originally Posted by Skywave View Post
Kalee20 - thank you.

Your post causes me to ask you this: if such bandpass filtering was such a worthwhile feature with all the benefits it provided, why did some radios (of this vintage to which I have referred) use a valved RF amp. instead?

Al. / Apr. 23
The most likely answer is that an RF amp with its own tuned circuit gives even better performance but at extra cost. The fact that bandpass tuning was uncommon in later lower cost radios with 465 kHz etc. IF shows how cost conscious at least UK manufacturers were - they couldn't justify the extra cost of bandpass filtering and its required 3 gang tuner.

John
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