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Old 3rd March 2013, 05:23 PM   #1
Katch is offline Katch  United Kingdom
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Default What shall I build/do with this lot of tubes?

After a project for this lot.

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Old 3rd March 2013, 07:17 PM   #2
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It's hard to read all the labels and, obviously, you have to allow for 2 channels.

The EZ80 and EZ81 are rectifiers. The EF86 is a small signal pentode. The ECC83/12AX7 is a twin triode.

The ECC88, AKA 6DJ8, is a very popular twin triode. Several designs are available for phono preamps that use the type. However, Mullard made ECC88s are valuable and the best thing to do might be selling them off to fund the project.

Do you possess 2X ECL82s or, even better, 4X ECL82s? Nice, LOW power, amps can be built around the type. Very sensitive speakers are a MUST in combination with "flea" power.
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Old 3rd March 2013, 08:47 PM   #3
Katch is offline Katch  United Kingdom
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They are;

2 x ECL86
7 x ECC83 Mullard + the Pinnacle ECC83 for a total of 8
1 x ECL82
1 x EZ81
1 x EZ80
1 x EF86
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Old 3rd March 2013, 09:32 PM   #4
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Like ECC88s, Mullard made ECC83s are quite valuable. The ECC83/12AX7 has wide application, especially phono.

The ECL86, AKA 6GW8, is a nice tube, but getting scarce. You could build a quite decent singled ended, low power, amp around the 2 bottles. Before you go that route, make sure you acquire at least 1 set of spares. Tubes are consumable and require periodic replacement. A look at the 6GW8 data sheet suggests you would get approx. 3.5 WPC. The EZ81 would do very nicely in the B+ supply for that amp. You need appropriate, high sensitivity, speakers.

Sell the single ECL82 and single EF86 off.
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Old 3rd March 2013, 10:01 PM   #5
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2xECL86 - EZ81 - EMM801 (dual/stereo magic eye) was my very first tube amp. See attachment. Delivering over 4W to some SABA Greencones. Sound was lovely. Absolutely basic schematic with operating conditions according to the datasheet (250V, 36mA, 7K-OPT). But after listening more to Rock and less Classic (Went to a Popa Chubby concert), I needed more power and built other amplifiers.

But, remember, the most expensive part are the transformers. Often it's not really useful to start a project with some tubes you found in your attic.
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Old 3rd March 2013, 10:15 PM   #6
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Goodness. I remember Pinnacle Valves, the Rep from WillowVale used to sell us them if Mazda or Mullard weren't available!
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Old 3rd March 2013, 11:09 PM   #7
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But, remember, the most expensive part are the transformers. Often it's not really useful to start a project with some tubes you found in your attic.
True. However, the OP's ears could bleed if such a 6GW8 amp is mated to 100 dB. sensitive horn speakers. "Flea" power amps require very careful speaker selection.

As highly sensitive speakers are anything but inexpensive, the "best" action may be selling the cache off to fund (at least partially) a project that mates with less costly speakers.

Katch, be aware that a tubed amp that mates well with "Watt Hog" speakers will put a very serious dent in your bank balance. The magnetics for high powered tube amps cost a pretty penny, indeed.
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