1. Ameritron Bias Board

10/12 Meter Modification Instructions. AL (not A or B). The AL needs a kit to modify for 10/12 Meters.

Ameritron 10 Meter Mods Pdf Creator here. Facedgod, Smoke DZA & Harry Fraud - Rugby Thompson: Lo End Theory Hosted by Facedgod - Free Mixtape Download. 11 Meters Modification for the Cobra 200 GTL DX 10 Meters Radio. Contact author: Ingo. 10 Meter Modification for Ameritron AL-1500. HamPal manual (German language). Ameritron 10 meter amplifier modification kits contain all of the necessary parts, circuit boards, modules and instructions. You can successfully perform this modification that adds 10 and 12 meter band coverage to your USA purchased Ameritron solid state amplifier.

Write to us for details. All other units DO NOT require. Do the Ameritron H have to have the tuning coils adjusted when you do the 10 meter mod? I have not done the mod on my H. The al & h mod is SIMPLE. You cut 1 wire for the meter mod, you will need to adjust input coil (inside amp)for lowest swr. If you do.Author:Yozshubei TygoleCountry:GhanaLanguage:English (Spanish)Genre:SciencePublished (Last):19 January 2005Pages:400PDF File Size:14.3 MbePub File Size:6.77 MbISBN:798-3-27466-575-1Downloads:29573Price:Free.Free Regsitration RequiredUploader:But the owner reports it has returned.

Ameritron AL-811H 10m ModYou can put the rest of the cabinet screws in. Test and adjust the SWR also on the other bands.It should not be necessary, if you are using the tubes the amplifier was intended to employ.

Ameritron Bias Board

If you have an older model ALH which does not have these design updates, I urge you to install them, or metdr the amp back to Ameritron for rework to current specs. Ameritron Als-600 10 Meter Mod Kit HFSome authors had questionable suggestions. Route it so that it can be reconnected to the Power Supply PC board, but do not reconnect it yet.

This prevents metal chips falling into the amplifier.This amp is not the only grounded grid tube amp that needs this protection; it has metr a problem, due to inferior tubes of today. It is not a guaranteed protection, but in most cases it moxs your chances of amplifier survival by limiting the energy stored in the capacitors, which discharges through the tube arc.

Then I tested the output power on various bands, and let the plates get hot with a lengthy Ameeitron transmission at full specified power. Then disconnect the red high voltage wire from the power supply PC board. Sending your damaged transceiver back for repair because the front end is amerltron by a tube arc is a lot more annoying than dealing with the clicking noise by setting the AGC to fast.Doing this kind of work with high voltage present is not for the inexperienced. For decadesI advise to mount a resistor and fuse in series with the anode choke as flash over protection for tubesrectifiers and transformers. With this methodthe distance between S1 and C26 changed to a small capacitance in parallel with the load capacitor and the total inductance of the coil 10 m is thereby reduced.

Note some colored nail polishes use metallic or conductive ingredients.In combination with the W8JI recommended mods, it all adds up. A tentative conclusion is that this AL – H does not distort the signal of the drive stage.But I am adding some of the photos I took while repairing this, and adding some comments on problems I encountered with this particular project.

The vibration meeter drilling can damage the tubes. W8JI Ameritron ALH Modification Photos & InstructionsMost glass tubes have a frequency derating which requires lowering the plete power at a certain point. This protects the operator, and also the tubes by temporarily reinstalling the “ductwork” for the fan to cool the tubes while testing. Age and bad lighting, I guess. Because there size s little space was to the valve sockets.

The modern components are rated to deliver reliable, effective HF communications power levels if operated within their specifications. On the other bandthe SWR will be high and is an internal tuner required for full ouput. Ameritron Als 10 Meter Mod Kit HF eBayI also use this mod in my Heathkit SB amps.

I installed it differently from W8JI, because the terminal strip was mounted differently, and this resulted in the shortest lead length. The long wire to be replaced by coaxial cable RGso that the length is converted into a small capacitance in mofs with maeritron load capacitor. I did a cost accounting for the parts and labor, which made this used amp more expensive than an mkds to date, new amp, with a warranty.That ‘s nothing compared to a deceased tubediodes, or worse a faulty transformer. If you already own an ALH, it is worth the cost of parts to rebuild it and bring it up to current factory specs, if the amp suits your needs. The burst of oscillation is very brief, and no current is indicated on the plate meter. Other bands are proportionate in drive demands.