For sale a large lot of 18X EL84, tested tubes!
Most of them are Tungsram, some are RFT or Polam.
They have been tested for plate current and for transconductance with good results!
See on the tags on the tubes! (100% is I:48mA, S:11.3mA/V)
See condition on the photos!
The price is for the lot!
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About the testing
Most of my tubes are tested, but always pay attention to the description in the listing!
Vacuum tubes can be tested for variety of attributes, but they are very rarely tested for everything. I usually test for the attributes I find most important with the specific tube.
I take responsibility for these measurements, but not for other attributes that I have not tested!
Also keep in mind that when measuring vacuum tubes with different test equipment there will always be differences in the results. However these differences shall not be significant (usually within 15%), and when done right, won't show a bad tube as good, or a barely good tube as very strong.
If you are not sure what you need, or how to choose, message me, and I will try to help you make a decision that fits your needs.
Tests I do:
- Ia / emission test - is the most common test, which shows how strong is a tubes' plate current according to nominal catalog data. The tests are done usually on a standard operating point, and these values will be shown on a tag, or in the description.
Usually above 80-90% of nominal we say it is Strong (or NOS), and above 60% it is still Good.
- S / transcondutance test / or GM - is the second important attribute of a tube indicated as mA/V. These tests are done at the nominal plate current, and also will be indicated on the test tags.
- Noise test - is made where it is indicated in the description. It means the tube has been tested for weird noises or microphony while playing music.
It will be shown on the test tag as a 
mark.
mark.Keep in mind that noise test does not guarantee any sound quality, which is always the product of a specific tube type, brand, Ia and S attributes, and the amplifier as a system. Noise test means that in a simple audio circuit the tube didn't make any disturbing noises, hum, and was not microphonic even when gently tapped.
(In an audio system many parts, or the setup can cause strange noises, but it is not necessarily sewn by the tube, but by certain interference.)
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Important notes
Safety Guarantee:
This tube manufactured according to the standards of its era and not tested according to modern GPSR standards! This tube was designed to operate safely under the conditions for which it was manufactured, for use in equipment compatible with vintage tubes.
I recommend using it with equipment compatible with vintage tubes to avoid risks of malfunction or damage.
GDPR Notice:
Your personal info (name, address, etc.) is used solely for fulfilling the order. It is not stored beyond what is required for shipping.
GPSR Compliance:
These are vintage collectors' items of historical interest (CN 9705 0000 30), exempt from the GPSR regulation under EU Directive 2006/112/EC.
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Shipping
The tubes will arrive to you in a well protected package, and will be shipped within two business days from payment.
The package will be sent with priority, and tracking number will be provided.
If you find other tubes in my inventory, I will gladly combine shipping, and the cost will stay as listed under 0.5 kg total .
For a package that exceeds this weight, we shall discuss the shipping cost.
Returns :
All items are offered as vintage collector's items, often many decades old. No warranty or safety certification. Returns accepted within 14 days of delivery, in case the item doesn't match the description. Items must be returned in the same condition and packaging. Buyer covers return postage! Refund is issued after the item has been returned, and retested in order to confirm, they are in the same condition as sold.
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About me
I am a seller located in the EU. I buy and sell vacuum tubes.
I'm dedicated to reserving this beautiful technology, and for that purpose I select, test and rate my tubes.
I build my own testers, work with them daily, and I know how they operate. I also a test enthusiast, who likes to learn more about tubes and tube testing.
I am dedicated to sell tubes as described, and believe these tubes will perform as they should be according to the description.