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an electronic device with two different types of tubes

You Can DIY! A 25W OTL Tube Amplifier

an electronic circuit diagram with the components labeled in blue and red on top of each other

an electronic device with two speakers attached to the front and back sides, on top of a

A PL-177 Single-ended amplifier - www.pmillett.com

The PL-177 is similar to the 4-65 tube. But it is a pentode, or more correctly a beam pentode. It adds a supressor grid which is constructed of vanes to funnel the electron stream into beams. It comes in normal (PL-177A) and military (PL-177WA) versions. It also has a close cousin, the (PL-) 6549, which is essentially the same tube with a conventional suppressor grid. I tested all three... the PL-177A and PL-177WA seem completely identical. The 6549 worked well but was slightly less linear.

an old fashioned radio with electronic components in it and instructions to build the retro rege radio

BUILD THE RETRO REGEN RADIO - www.nutsvolts.com

In this article, I will describe how to build and operate the broadcast band version. Should you decide to tackle it, I can promise you many hours of fun both in the building and in the listening for distant radio stations.