dougsta's latest activity
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dougsta replied to the thread Transformers - the how, why, when and where!.Good question! When using salvaged parts you have to deal with what ever was used, often not possible to even see clearly the... -
dougsta replied to the thread Can you functionally test a 12AX7 for balanced triodes in an amp?.From the video description: "Using an oscilloscope, and two probes, you can perform the balance of a phase inverter via this process...
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dougsta replied to the thread HAMMOND branded tubes.Check the etched codes against this page to find out when and where they were made, the printed logo is marketing (but adds a huge...
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dougsta replied to the thread HAMMOND branded tubes.Let me know if you want more!
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dougsta replied to the thread HAMMOND branded tubes.A bunch of vintage EL84's, the tooling mark is a single line, not a cross!
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dougsta replied to the thread HAMMOND branded tubes.An EF86 from 1958 with the type and date codes upside down!
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dougsta replied to the thread HAMMOND branded tubes.ECC83 from Mullard and Telefunken (has white writing on the top) and a Tungsram 12AU7 made by Mullard Blackburn factory in 1962.
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dougsta replied to the thread HAMMOND branded tubes.Close up of the cross mark, the one on the left is the mC1 ECC83 with goal post getter, the one on the right is a 1958 Mullard ECC83...
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dougsta replied to the thread HAMMOND branded tubes.Here is a Brimar 12AX7 black long plate from the 1950's, it doesn't have the cross mark on the top. Brimar used their own tooling.
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dougsta replied to the thread HAMMOND branded tubes.Here is an mC1 revision ECC83 from 1956 B6B factory and date code (aka long plate square/goal post getter)
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dougsta replied to the thread HAMMOND branded tubes.Stand by for some vintage valve pr0n... Here's some pics of my vintage audio Mullards + others. You can tell a Mullard (whether made...
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I cant telefunken difference! 😜 Sorry, slow day here!
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dougsta replied to the thread Bassman Micro EF80 PT: Still another idea.I cheat and roll my own iron! Always a good idea to have a stock of beefy resistors handy though, try a few dropping options (series or...
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dougsta replied to the thread Shock mount tube sockets? Yet another thing I didn't know....Just checked my EF80 amp, I used the McMurdo skirted sockets on the 2 preamp EF80 valves and regular McMurdo sockets on the PI and OP...
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dougsta replied to the thread Shock mount tube sockets? Yet another thing I didn't know....I used 5 x EF80 valves in my EF80 pp amp head, 2 for the pre amp, 1 for PI and 2 for the pp output stage. I used McMurdo skirted...
