Model     W/ch Tubes Bias (1)    Adj     DC/Bal  AC/Bal  Opt Xfmr   Pwr Xfmr

222        15  6BQ5  Self        No      No      Yes (2) TRA-7-1    TR-12-7
222B       15  6BQ5  Self        Yes (3) Yes     Yes (2)
200        15  6GW8  Fixed       Yes     Yes     No      TRA-8-6    TR-12-12-1
200B       15  6GW8  Fixed 35 mA Yes     No      No      TRA-8-6    TR-12-12-1
LK-30      15  6GW8  Fixed 35 mA Yes     No      No      TRA-8-6    TR12-12-1

299        20  7189  Fixed       Yes (3) Yes     Yes (2) TRA-8-4    TR-12-3-1
299B       25  7189  Fixed 55 mA Yes     Yes     Yes (2) TRA-8-5    TR-12-3-1
222C       24  7189  Fixed       No      Yes     No      TRA-8-5-1  TR-12-3-2
222D       24  7189  Fixed       Yes     Yes     No      TRA-8-5-1  TR-12-13
LK-48      24  7189  Fixed       Yes     Yes     No      TRA-8-5-1  TR-12-3-1
LK-48B     24  7189  Fixed 44 mA Yes     Yes     No      TRA-8-5-1  TR12-13
399    (5) 20  7189  Fixed       Yes (3) Yes     Yes (2) TRA-8-4    TR-12-9

233        33  7591  Fixed       Yes     Yes     No      TRA-8-5-4  TR-13-3-4

299C       40  7591  Fixed       No      Yes     No      TRA-11-2   TR13-3
299D       40  7591  Fixed 70 mA Yes     Yes     No      TRA-11-2   TR13-3-2
LK-72      40  7591  Fixed       Yes     Yes     No      TRA-11-2   TR13-3
LK-72B     40  7591  Fixed 70 mA Yes     Yes     No      TRA-11-2   TR13-3-2
208    (4) 40  7591  Fixed       No      Yes     No      TRA-11-2   TR13-3-2

340    (5) 30  7591  Fixed       No      Yes     No      TRA-8-6    TR15
340B   (5) 35  7591  Fixed 70 mA Yes     Yes     No      TRA-8-5-3  TR15-2
380    (5) 35  7591  Fixed       Yes     Yes     No      TRA-8-5-3  TR15-2
345    (5) 32  7591  Fixed       Yes     Yes (6) No      TRA-8-5-3  TR15-2

272        44  EL34  Fixed       Yes     Yes     Yes (2) TRA-12-2   TR-30-5
290    (4) 50  EL34  Fixed       Yes     Yes (6) Yes (2) TRA-12-2   TR-30-4

296        50  7581  Fixed       No      Yes     No      TRA-12-2-1 TR-30-6

LK-150 (4) 65  6550  Fixed       Yes     No      No      TRA-15-2   TR-30-4-2


Note 1. Bias current is the total cathode current for both tubes in a channel.

Note 2. Early amplifiers used floating paraphase phase inverters, with AC
        balance controls. Later amplifiers used split load phase inverters,
        and eliminated the AC balance controls.

Note 3. Has common bias control for both channels.

Note 4. These models are basic Stereo Power Amplifiers.

Note 5. These models are Receivers.

Note 6. Has individual bias controls for each output tube.

                                                                      2/24/00