Post Pics of tube amps here

[skybolt58]

MY SCP old tube amp

Gee I would love to find any info on this amp? it works great, but the pre amp makes the recieve have a hum? makes people sound electronic, but it works

As you can see it is well protected

 

[Drifter]

Here are two of the smallest from my collection. 1st is my Heathkit SB220 the work horse in my shack. 2nd is my B bias (12) 2sc2879 Xforce Mud Duck Stomper.... Notice it is heavily filtered. Both are hell in DX land when dumped into my BEAM.

685 in MD just got down!!!

 

[Farm Boy]

Palomar 321

That is Palomar 321 that someone put a SCP sticker on. Electrically they are a Skipper 300, one (1) driving three (3) and most likely running 6LF6 or 8950 tubes.

Gee I would love to find any info on this amp? it works great, but the pre amp makes the recieve have a hum? makes people sound electronic, but it works

As you can see it is well protected

 

[sp5it]

Just my amp.

Well made ukrainian build amplifier. 1.2kW PEP.
Mike

 

[bigred222]

BUMP FOR SOME NEW PICS

 

[Drifter]

My Big Box.

 

[bigred222]

isnt it common practice to use a copper STRAP between the top of the tube and the tuners. after a while the rubber will melt.

 

[Drifter]

isnt it common practice to use a copper STRAP between the top of the tube and the tuners. after a while the rubber will melt.

It works better with the rubber wtf... I have no problems at 6k Bird. Call the builder and tell him you have a problem with the rubber being there. PS I don't think that's rubber:headbang

 

[HiDef]

Yes, there can be high circulating current between the anode connection and the Pi-net especially on higher bands like 11 meters. A high current connection should be used to maximize boid whats.

The thing that isn't cool (as I said before) is the apparent lack of a safety choke. This could lead to some mudduck getting killed.

 

[bigred222]

Yes, there can be high circulating current between the anode connection and the Pi-net especially on higher bands like 11 meters. A high current connection should be used to maximize boid whats.

The thing that isn't cool (as I said before) is the apparent lack of a safety choke. This could lead to some mudduck getting killed.

COPY ON DEATH BY HIGH VOLTAGE

 

[Shockwave]

My Big Box.

No DC blocking choke. One inch nickel plated standoff used on tank coil. No low inductance strap to tube anode. No attempt to shield filament primary or secondary from tank circuit. No Teflon coax connector. No vacuum relay. No plate or grid current meters. Poor air circulation through holes in RF deck. No glitch resistor in B+ line. No shielding on plate voltage meter. Wrong 3-500Z style parasitic suppressor. All that and I haven't even seen the bottom or the power supply. It doesn't take a wizard to figure out that there are only about 13 parts on the top of this RF deck and about as many mistakes.

 

[bigred222]

i know someone will chime in at shockwaves comment

 

[Shockwave]

This is an example of a bowl box built over 15 years ago with quality in mind. It makes use of a protection board based on opto couplers to provide adjustable plate and grid current overload protection. The filament supply is voltage regulated and current limited. Timer circuits are used to prevent B+ application before the tube is warm. Safety interlocks are all over the cabinet. An outboard 25 KVA pole pig and a 650 CFM dual blower are installed!

 

[bigred222]

what's a pole pig

 

[Drifter]

No DC blocking choke. One inch nickel plated standoff used on tank coil. No low inductance strap to tube anode. No attempt to shield filament primary or secondary from tank circuit. No Teflon coax connector. No vacuum relay. No plate or grid current meters. Poor air circulation through holes in RF deck. No glitch resistor in B+ line. No shielding on plate voltage meter. Wrong 3-500Z style parasitic suppressor. All that and I haven't even seen the bottom or the power supply. It doesn't take a wizard to figure out that there are only about 13 parts on the top of this RF deck and about as many mistakes.

Hey I am packing it up as we speak. I am shipping it to you so you can fix the errors and make it 10-8. But seriously It's a bowl box and it is working as is, and my pockets are but so deep, but I have a Tokyo HP in mY sights for my HF station