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think I found a patent relating to the AT360. http://www.freshpatents.com/Condenser-microphone-dt20051117ptan20050254671.php

mshilarious Fair reply. I was not sure what the AT uses I have read different tube numbers in the past on the web. Did you open one and see the number? Or maybe from the last post you own one? I was posting in general about the idea of a tube powered by phantom. The .5ma guess is from...

First if you are buying a tube microphone without a power supply AT4060(that needs a power supply) I would check if it was stolen. Now people you need to think in terms of power for a phantom powered tube microphone. DC Power = voltage x current transformers have the same power(- core...

If you are using the Apex 460 website schematic you need C8 it "blocks" DC from the output transformer the current that flows effects the transformer in a not good for sound way. Something is wrong with the microphone if you don't have good output with the 6072a/12ay7 Change the capsule back...

give me a call first. You might want to hear my modded K2 or a few other modded or built from parts ones.

I made some time to read thur this thread. I use a polypro or PET at C8 depending on what is wanted The china microphones I have seen like this have had films at C4 Depending on the the tube I change the grid to ground resistor R6. With 12ax 12at you might want to keep it at 200meg. Its a...

Is that you Bobby S? If so the I lost your number and message on my machine because I replaced the phone. give me a call. I have a better circuit for that microphone. People are missing a circuit I posted in the past. Also people are missing some problems with the power supply. Still have...

I measured 11:1 on mine as you can see from the schematic. With a 10:1 or more removing the CF works fine. don't wire that fil half and ground the plate grid and cathode removing the cathode resistor. Connect the plate of the 1st half of the tube to the transformer with a good cap, 1uf poly...

you need to look at other parts of the circuit. There are a few other problems with the microphone and power supply. A lot of the questions are answered at another forum.

Ausrock That looks like a "standard" type circuit. It looks alot like the circuit in sampsoms C01s and C02s. The single transistor should be a fet marked 105 or 305 the IC is a dual PNP pair I believe. Could you post the numbers and values of the caps I can't see. The two small...

I would go for the 414 they have a better resale value some of the other microphones might not even have a resale value. They are also multpattern There are not alot of sub $1000.00 microphones I like stock IMHO. The SP line seems to be a safe purchase to me I own a C1 it is good microphone I...

Flatpicker did you get a chance to work on the MXL???

Thats odd. I own a nt1000 , SP C1, and a bunch of v67s. I use the v67s for the body and capsules I change the electronics to tube or SS. The NT1000 is built like a tank but I could not stand it stock so I upgraded some caps. I left the C1 alone. I compare the microphones to a Brauner VM1...

The microphone has elements of a few microphones. Neumann type capsule like used in the u87 u67. Body and color kind of like an AKG. 1/2 a 12at7 like of like a a neuman gefell um57. U67 use a plate load of 150K elam 251 with 6072s use a 100K. Not tracing the circuit I don't know what one...

3 uf film cap nice. I have fit 1uf PET films in 012s

The capsule loks more like the kk67/87 dual backplate. The k47 is a single backplate like the m7. The cap used from the plate to the transformer should be around 1 uf. 1uf polypro at 250V are not to big it could fit in there somehow. This looks like a standard type tube circuit to me, you...

I like the multpattern 797 capsules. I have beringer B2 pro that I am going to use the capsule with a sony c800g type circuit I built. The use of the bigger r wattage wise for the plate load it looks like a 100k to me helps with noise. The transformer looks different that other china built...

IMO the tube type used in the v69 is OK. I would try NOS 12at7s,12ay7/6072 GE 5 star. The way the tube is used minimizes any tube sound. The input section has alot of headroom and is being used with alot of feedback . The part that makes the biggest difference in this circuit is the 56pf...

I do a different mod to the 012s. I change the input cap to 1000pf polystyrene=>50V. The two rf caps to stacked film .01uf 50V PET. I change the 1uf tant to a 1uf stacked film PET 50V. The ouput caps measure OK on a sencore lc102, The good thing is that they have a good voltage across them...

First, Flatpicker made me aware of this site. The v69 uses both halfs of the tube in parallel 12at7?. It is set up kind of like the fet in the KM84. This also helps with noise. the gain is the openloop gain of the tube in parallel with the capsule capactence/by the feedback cap from Plate...