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| Homebrew 572B amp | |
Oct 04, 2009 - 6:42 AM - by Captain Kilowatt |
Well I just got off work this morning and thought I would start this thread before catching a nap.As discussed in the other thread,I plan to build a 4 tube 572B amp I have a cabinet that needs some paint and the first decent day I get next week it shall receive that paint.Black hammertone on the outside and a flat textured black on the inside. The front panel will be either hammertone gray or just regular gray.Here is the cabinet.Note the 12 inch ruler for scale.
Here is the loading cap I was going to use. It is 2000 pF but is too long and quite hard to modify. It has ceramic insulators holding it together and that makes it pretty hard to shorten. I have some other caps suitable for loading caps in an amp this size so it's time to find out where I stashed all my goodies.
Updates in a few days after I have a chance to get to it. I work Monday and Tuesday and then off for nine days,back for two more and off another six so I hope to get a decent start on this project.
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18 Replies | | HF homebrew tube amp photo build | |
Sep 30, 2009 - 2:19 PM - by Radio Tech |
Been digging through info for about 6 months now.
Next project, HF all band amplifier.
Took me a while to decide on what tube to use. So going to use the 811a since a have a shelf full of them. Now to decide on how many to use. Seems 4 was the magic number but maybe more. Have to do the math.
I got this huge black ugly case I need to do something with.
Pics to follow as this comes along.
May be requesting folks to check their junk boxes! 
Below is the chassis I am going to use. For the last 20 years it has been a power supply ranging from 5 to 800 volts. Time to give it a new face and use it for something more usful. It this case, an HF Amplifier.
It is a rather large enough chassis to handle the project.
 ... [Read More] | |
38 Replies | | New Sweet looking Ten-Tec 707 desk microphone available | |
Nov 13, 2009 - 1:50 AM - by moleculo |
I stumbled across this new mic today that Ten-Tec has coming out this month:
It's $139, comes with a nice case and cable. The base is extra. Here are the specs:
TYPE: Uni-directional dynamic microphone.
FREQUENCY RESPONSE: 50-16000 Hz
SENSITIVITY: 78 dBV +/- 1 dBV 1 kHz (0 dBV = 1 V/u Bar 1 kHz)
OUTPUT IMPEDANCE: 250 ohms +/- 30%
HOUSING: Chrome Plated
DIMENSIONS: 6 5/8" H x 2" W x 2 5/8" D (16.8 x 5.1 x 6.67 cm)
WEIGHT: 1 lb., 3 oz. (540 g).
If anyone picks one of these up, give us a review!  | |
4 Replies | | Ameritron ATR-30 3KW / Legal Limit Antenna Tuner Review and Pics | |
Nov 13, 2009 - 1:43 AM - by moleculo |
I've had the Ameritron ATR-30 3KW antenna tuner for a while, and I thought that it would be neat to show some inside pics and also give a brief review of this tuner.
Here is a pic of the front panel of the tuner. It has an active peak reading cross needle meter, an on/off switch for the meter and inductance turns counter meters, high/low and peak/avg meter switches, antenna switch, and the usual capacitors and inductor knobs.
Note that the inductor is a roller inductor for infinite tuning adjustments.
Here is the back side of the tuner:
You get two tuned antenna coax connectors, one additional direct, untuned antenna coax connector, balanced wire and long wire connectors, ground terminals, and the power source for the meter. Note that you can only use either the balanced line or wire connection; you can't use both.
Here is an inside pic of the tuner. The size of... [Read More] | |
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