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Re: [Amps] Machlett 3-500z

To: AMPS <>
Subject: Re: [Amps] Machlett 3-500z
From: Alek Petkovic <>
Date: Tue, 25 Jul 2017 07:22:04 +0800
List-post: <>
Yep. There is nothing wrong with any of the 3-500ZG tubes. If you buy enough of them from the factory, they'll stamp whatever brand you like on them.

They are as good as anyone else has ever made, with perhaps one proviso. It is strongly advised to use them and get the anodes red, regularly.

Don't leave them unused in the amp or on the shelf. They'll go gassy and create big problems.

Keep 'em gettered and they'll serve you well.

73, Alek.

On 25/07/2017 7:04 AM, Terry Hart wrote:
Thanks Dennis. That's exactly the type of feedback I was looking for.  Any 
further feedback on personal experiences would be very helpful.
Best, Terry G3VFO
   ----- Original Message -----
   From: Dennis Kippa
   To: Terry Hart
   Sent: Monday, July 24, 2017 5:36 PM
   Subject: Re: [Amps] Machlett 3-500z

   I purchased 2 3-500gz from Mississippi and have had them in service for 5 
months.  I drive the tubes with 90  watts from a Flex 3000 and I get 1500 out.  
It will do MORE.  I am happy with the purchase and the performance.

   On Sun, Jul 23, 2017 at 2:08 PM, Terry Hart<>  

     I  see from their website that RF parts will supply 3-500s only to 
customers within the CONUS area. That leaves the rest of us having to look 
elsewhere, so it would be useful to hear of the experiences, good or bad, of 
those who have bought these Machlett tubes 'direct'.

     Terry, G3VFO

     ----- Original Message ----- From: "Roger (K8RI)"<>
     Sent: Friday, July 21, 2017 10:33 AM
     Subject: Re: [Amps] Machlett 3-500z

       Warren,  that price difference sounds about correct to me.  RFParts 
tests and I believe, guarantees their tubes which are likely the same brand 
which they most likely purchase enough to receive a quantity discount.

       Purchasing direct often saves money. Sometimes it can be substantial because you 
are assuming the risk while the US reseller has the cost of the time and paperwork 
invested in testing tubes they may, or may not be able to return. With some NOS tubes 
there is substantial risk from "infant mortality". You are often safer paying 
more for the new tubes than less for the older NOS versions where both are available.  
Direct Vs through a US retailer?  You are playing the odds and taking on the risk 
yourself Research the viability of the tubes before making your decision.  Price 
differentials and risk can vary considerably.

       73, Roger (K8RI)

       On 7/20/2017 Thursday 10:46 PM, Warren Volz wrote:

         Tonight while searching for 3-500z on eBay I discovered this listing:

         I know all 'new' tubes are made in China and the rfparts version seems 
to get the best reviews. Any idea what the deal is with these Machlett 'factory 
direct' models? They are $90 less than rfparts. Are they the rejects from 
elsewhere or the manufacturer trying to undercut the market?

         -Warren KD5YPH
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