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Be careful over 200 ohm resistance in a DC choke tends to slow the sound of the amp down and dynamics suffer .

Hi, How is the bass response with the Bugle SE 45 , the coupling cap in the original schematic ( 0.067uF @ 5Hz ) or even (0.047uF uF @ 7.2Hz ) suggested looks to small , and the -3dB corner frequency with a 3Hz roll off with a 470K load resistor on the grid of the 45 would suggest a 0.11uF...

Yes i will head of to the emporium if this venture takes off , thanks for the heads up,

Will go measure them. I think I will make a number of these for 45 and 2A3 to start with . The 2A3 will require approx 60mm lamination thickness . They will be %50 initially and about 1/2 the price of the guy who makes them stateside .

Seems the last chapter in this Sony 5K Tamradio cooked output transformer tear down . 3P/2S sections layering . The 8 ohm secondaries are not multifilar wound , which would account for the HF roll off at 18kHz according to the Sony manual. IMHO what are most likely Permalloy core's account for...

Hi, I tore down the cooked Sony Tamradio output transformer . The Laminations tested so far are soft shiny and easy to bend by hand as you would expect from Nickel / Permalloy , they are not Silicon steel . Oddly some appear to have a copper coating very strange , don't think it's the wax ...

One of the Sony Tamradio's I have is cooked so will pull it apart and have a look . I did pop the bottom cover off and all the laminations appeared clean and the same colour .

Watched Meet the Fockers and R sole was prescribed fairly early on in early vocab, so get the gist of that one . Having fun with batch home brew with the neighbour these days !

Yep the old Tango U808 was not very good , the HATT HO-808 is only similar in name only . Its a very different piece of gear nearly a kilo heavier and was built to compete with Tango XE-20 , more extended on the bottom end slightly less on the top end, always thought the XE20 needed more bass...

The HATT Audiolab new HO 808 is very good 10Hz -80kHz -2dB When Tango ceased production HATT Audiolab Japan reversed engineered most of their line as drop in replacements The HO -808 is 2.5kg the old Tango U808 1.6kg . The new HO-808 is much better retaining 2.5K 3.5K 5K primary etc $120 USD...

4P1L

I think you would get better results with a triode strapped 4P1L driven close to A2 2- 2.5 watts 1.2K Plate R in triode , far less distortion near full power than a 45. A PSE 6BL7 can be driven much harder than the manual dictates at 12 watt max both plates max dissipation , which would be...

Generally Nickel is part layered with M6,the later Tamura permalloy were %38 Nickel. Those small 5K Tamradio's aren't up for more than 3 watts anyway.

Seems the Sony Tamradio 5K at -1dB 39Hz looks to be better in the bottom end to the 7watt 5K Hashimoto http://tube-amps.net/images/Hashimoto_Specs/H-507S_1024.jpg

Will measure the Sony Tamradio with a SE 6BL7 plates strapped together. The metal is silver/ white and looks very much like Nickel - Permalloy probably accounts for the drop in inductance to 16H rather than the copper difference between the Akai and Sony Tamradio . With some CFB should be able...

Great , saves some work . Sony 15H- 0mA DC Akai 24H-0mA DC quite a big difference for same size iron

Will measure both with the Akai M8 and Sony TC500 Tamdario transformers for freq responce with the Tektronix . Will also measure inductance ,but by the sheer size they are unlikely to produce any serious bass below 40Hz . The Tamradio has a 600 ohm winding so maybe quite useful for a headphone amp

I have a set of Akia M8 transformers and waiting for an old Sony TC-500 to turn up. Will compare the two, as they seem to be the same size measurement wise . The M8 are not Nickel, sanded off the surface corrosion and they are GOSS . Will do the same to the Sony Tamradio

Some say the Sony TC 500- Tamradio output transformers are Nickel Alloy ?