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Call Sign : 108-CT-226 / MM0IMC Posts : 38 Times Thanked : 2 Join date : 2023-03-10 QTH or Location : Ayrshire Equipment Used : Amstrad 901 Sidebander
Subject: Re: Final Amplifier Build... Thu Jun 08, 2023 2:20 pm
Here's the sound level of the amplifier, now fitted with sound dampening material...
Victor likes this post
SangueG Major contributor
Call Sign : 26-CT-3971 / 2E0LMI Posts : 1007 Times Thanked : 61 Join date : 2021-01-30 QTH or Location : Cirencester, Gloucestershire Equipment Used : Little radios, home-made antennas
Subject: Re: Final Amplifier Build... Fri Jun 09, 2023 6:02 am
A fitting name for its sound. I do love the metal finish though so hope you're not going to give it an orange lick of paint...
MM0IMC likes this post
Alan Pilot Major contributor
Call Sign : 163-CT-220...MW7TTA Posts : 2372 Times Thanked : 60 Join date : 2019-11-19 QTH or Location : Anglesey North Wales Equipment Used : Yaesu FT-991A,,Yaesu FTDX-10,,Icom ic-7300,,Anytone AT-D878UV PLUS",,LINCOLN II+. Age : 149
Subject: Re: Final Amplifier Build... Fri Jun 09, 2023 6:40 am
Good brand that Flymo. Victor runs a Flymo antenna.
Victor, SangueG and MM0IMC like this post
MM0IMC New Member
Call Sign : 108-CT-226 / MM0IMC Posts : 38 Times Thanked : 2 Join date : 2023-03-10 QTH or Location : Ayrshire Equipment Used : Amstrad 901 Sidebander
Subject: Re: Final Amplifier Build... Fri Jun 09, 2023 8:37 am
SangueG wrote:
A fitting name for its sound. I do love the metal finish though so hope you're not going to give it an orange lick of paint...
Painting is a real hassle, as I would have to use a special primer for aluminium.
Victor CT Directors
Call Sign : 26-CT-3228 / M7VIC Posts : 5188 Times Thanked : 326 Join date : 2019-11-10 QTH or Location : Bedford Equipment Used : Various
Subject: Re: Final Amplifier Build... Fri Jun 09, 2023 8:43 am
It's from a Bosch Alan. Lot less bovver than a........oh wait, that's the other one.
Bit of a whir going on there Ian but if it's keeping it all cool and working who's to complain.
It's only when it's married up to certain setups that it becomes a problem.......
"The name this way is Brian..." (What's that all about?) "Currently running a H**l boom mike." (Ah, that's why I can hear the whir in the background...and the dog passing wind....or was that you? )
Great job there Ian and you should be suitably proud of your efforts. Well done. (Love the Dymo labels!)
MM0IMC likes this post
MM0IMC New Member
Call Sign : 108-CT-226 / MM0IMC Posts : 38 Times Thanked : 2 Join date : 2023-03-10 QTH or Location : Ayrshire Equipment Used : Amstrad 901 Sidebander
Subject: Re: Final Amplifier Build... Sun Jul 02, 2023 12:28 pm
I removed GI-6B valve from the RF deck and replaced it with the original GI-46B valve. I've removed 3 transformers and replaced them with a single toroidal one. This supplies the high voltage, 12.6V AC for the valve heater and 17V AC for the 12V DC rectifier (relays, etc).
It'll still do 400W, but the GI-46B valve is a bit more robust that the GI-6B version...
I've also added a better HV rectifier board, bought bare from eBay. It's now working, so I'm not spending anymore time and money on it. It'll put it away to one side, to collect dust...
GaryWilson and SangueG like this post
MM0IMC New Member
Call Sign : 108-CT-226 / MM0IMC Posts : 38 Times Thanked : 2 Join date : 2023-03-10 QTH or Location : Ayrshire Equipment Used : Amstrad 901 Sidebander
Subject: Re: Final Amplifier Build... Sat Jul 08, 2023 9:53 am
Post script... I couldn't get the efficiency from the GI-46B valve I was expecting, so I put the old GI-6B valve in - Bingo! The GI-6B valve is performing as it should and I'm getting the performance I expected.
Today at 10:33 am by Pauline Flynn
Subject: Re: Final Amplifier Build... 
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