This beautiful Art Deco radio is in working order but has a mark on the top where the varnish is damaged. 95/101 Black White Trainer Ace 3x Forced Back - EOJ-EN060 - Rare LP Yugioh My City: PRESALE board game thames and kosmos New LIONEL 6-83286 E JOHN DEERE.Art Deco Radio (His Masters Voice) Fully Working. Open all year round, this pub like restaurant offers the best of both beautiful summer days and quiet cozy New England winters.I've been working on my next regenerative project and I've always admired the results that I have gotten from the circuit described on this page. Offering fresh local seafood as well as classic comfort food, delicious cocktails, and outdoor seating the best sunsets around. Thames Waterside is located downtown in the quintessential town of Bristol, RI.

It was coupled to the grid of the second triode by a 0.1 capacitor with the second triode also having a 1 meg resistor to ground. The plate load resistor of the first triode of the second 12AU7 was 100k. Wanting to stay at 12vdc per my design requirements I thought 'Why not just add a second 12AU7 and use the additional two triodes for AF amplification?'In lieu of the output transformer in the original schematic I used a 100k plate load and then coupled the output of that plate through a 0.1 capacitor to the grid of the second 12AU7 which had a 1 meg to ground.

Try adding a 10K resistor between the 100K plate load resistor of the middle audio stage and the B+. However, the problem is still not solved at this point.Am I simply piling too much gain into the circuit by having three AF stages after the detector?-You have three audio stages but no decoupling network. This only happens when the second triode of the second tube is brought into play and there are a total of 3 AF stages functioning.Shortening the lead lengths of my breadboard setup seems to help a bit as does reduces the individual plate load resistors down to a much lower value such as 10-22k. This does not happen when only the first tube is used and does not happen when only the first triode of the second tube is connected to the first tube. It seems like this is an AF based oscillation. The plate of the second triode is connected to the 20K tap on a Bogen T-725 multi tap output transformer.The problem that I am having is when I increase the regeneration before the set reaches RF oscillation a sort of secondary howl like oscillation sets in a good ways before the set reaches RF oscillation.

The extra cap and resistor shunt the audio to ground, rather than forcing it through the battery (or PS). The battery becomes a common impedance for the detector and audio stages, creating a feedback path. This is the usual cure for audio amp motorboating but the same mechanism can also cause higher frequency oscillation.

You can use a RFC there, but resistors are small and cheap, and work at least as well. On the schematic, replace that short straight line from detector pin 6 to C5 with the new resistor. This will shunt unwanted RF from the detector to ground, keeping it out of the audio amps where it can cause problems. It's not a critical value.

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